Car Overheats When Driving But Cools At Idle

But, it only starts to overheat when the gas is depressed. However, it's just fine when I'm driving along at 40 mph or more, even if it's very hot out or I'm going up hills. Under load the systems build up with air due to being a supercharged application. My car has been over-heating slowly over the last two or so weeks hovering above 195. If it starts to overheat when idle or stopped but then cools when moving, the air is blowing into it cooling it down. I dont have to be moving, but when I use the gas pedal it cools within about 10 seconds. Poor airflow, blocked passages, old hoses, bad radiator caps, blown headgaskets can all cause overheating. Ich have checked and replaced the fuse - it is not the. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. Overflow thank will not go down sometimes and it looks like it has no water in the engine coolant thermostat housing assembly. It only happens when you idle and, goes back to normal when you start driving? Then it's definitely that. Though it may be more costly, in the long run it's better to treat the underlying cause of a cooling problem instead of hoping for a miracle cure from a bottle. Changed thermostat, same problem. oo including purchase price and deer hit repair which is about $7,000 of that). If the engine overheats after several miles of driving or only overheats at low speeds, you should inspect the cooling fan operation and radiator. But when it goes back down from overheating, the power comes back, but at the same time, I still have cold air blowing out. Low refrigerant is certainly a possibility. I replaced mine on my own, but only because I had the extra time. 7/03/17 12:00pm. If the engine is overheating the A/C will turn off. there are a few other things to check. Sometimes it will overheat, then quickly drop back down to normal temperature, but then overheat again. [Archive] Help please!!! my 323 is overheating on idle but cools down when i rev the engine?? E36 (1991 - 1999) When a car is starting to overheat, the best way. My car started overheating (all the way into the red on the temperature gauge). I don't drive often so it hasn't been an is. We have a 2009 Edge SEL AWD model with 127k on the clock. If it is either the brake rotors or the brake caliper, a brake specialist will be able to look at your car and determine the problem correctly. Common Reasons Your Car Overheats Summer is here, and that means the temperatures are on the rise, but hopefully the same isn’t said for your vehicle. Sometimes there is heat in the car and other times this is not 3. Once you find where the freeze/core plugs are located on your particular engine, the tell-tale sign of weeping will be apparent. I can reverse this creep by simply turning the interior temp gauge to hot, but it drops faster if I turn on the blower as well. I was driving and my 323i e46 started overheating I will come to a complete stop and my car Will go to normal tempature and also my heater won't blow Pelican Parts Forums BMW E46 overheating while driving, cooling down while at idle - Pelican Parts Forums. Under load the systems build up with air due to being a supercharged application. the fans should come on at around 222 degrees take a look i bet they are not. It was the first time I'd really had the car out for a good boot, and it was mostly behaving well. You will especially be able to feel the difference when you accelerate. However, once the coolant is fully warmed from driving, the heat should not become cool at idle, such as when you stop for a traffic light, unless there is air in the system. The longer answer is a clogged raditor fins with too many bugs stuck between the fins. Chevrolet spark radiator fan not working. If I turn the car on from a cold start it will not overheat at idle. Twenty Reasons Why Your Engine is Overheating In this Truck Radiator guide we are going to go over 20 reasons why your engine may be overheating. The main goal of your car's cooling system is to remove heat from your engine block by running coolant through cooling passages and transfer that heat to the air through the radiator at the front of your car. If your car only overheats when it's sitting still, the fan may not be working, but the airflow created by moving is doing enough to cool the radiator. The second thing would be to make sure it isn't clogged. if the fan clutch is not working, when you stop at a light, the engine heat just collects under the hood. check the fans and see if they're cutting in and doing their normal cycle, check that the compressor clutch is cutting in, should be able to tell that quite easily. Car overheats at idle, but cools when moving? My car started overheating while I was stuck in traffic, I tried revving the engine a bit to see if it would cool it down but it didn't. Sometimes it will overheat, then quickly drop back down to normal temperature, but then overheat again. See Overheated Engine Protection Operating Mode for information on driving to a safe place in an emergency. If you look under the front of the car, there is a black plastic flap that hangs down a few inches. It didn't work but the very next day my car started to overheat. The longer answer is a clogged raditor fins with too many bugs stuck between the fins. So for long road trips, the engine fine. Tips and Tricks; My Car Overheats in Idle & Cools Down When Driving. It's possible that when the belt was done a sub-par water pump was used. Home Tips and Tricks My Car Overheats in Idle & Cools Down When Driving. If it is safe to do so, pull off the road, shift to P (Park) or N (Neutral) and let the Toyota Sienna engine idle. That's because the water pump runs at a high enough speed to force the remaining coolant through the engine faster. but when you get out on the road it cools down because their is more air moving through the radiator. 5L engine for leaks, and not all testing methods provide reliable results. More than likely, your thermostat is stuck. Your car may be old and it may be the POS that you call it everyday but you can smile a little because your car's problem can be fixed right at home. It didn't work but the very next day my car started to overheat. Chevrolet spark radiator fan not working. My car overheats when driving but not in idle. What to Do If Your Car Overheats If your vehicle overheats, the first thing you should do is slow down and find a place to let your engine cool down, either by driving slowly or coasting. This morning when I noticed that the coolant reservoir was low I filled it to the top (the car was cool at the time). Everybody with heat issues needs to also remember that no matter how you tune the carb, you can't drive the car like a race car with the stock radiator. Now, let's say your car runs cool at an idle but runs hot when driving down the road, or when pulling hills. Car overheats idling in traffic. It seems to be worse if the AC is on, but even with the AC off and driving at 65MPH+ on the interstate it will eventually still start to overheat. Mechanic did pressure test, checked belt slippage, and determined fans are not functional (intermittent). Car Stalls At Operating Temperature. Are these temps normal or still a little high? should i still drill holes or buy a different temp tsat?. Diagnosis & tests on 2004 Chrysler 300m - 3. Sometimes there is heat in the car and other times this is not 3. Make sure your coolant levels are correct. First, always carry an extra bottle of coolant (also called antifreeze) in your car, as well as a jug of water. 63 Galaxie with 390 overheats at idle. Re: Overheating at idle, fine while driving? (long I just experienced this today - sitting at a red light I heard the fan kick in and noticed the temperature gauge was rising fast. Why a car overheats when driving but cools at idle? check your fluids it is probably low on antifreeze and if it still does it change your thermostat that should fix the problem. my fan seems to be working too. It seems to be worse if the AC is on, but even with the AC off and driving at 65MPH+ on the interstate it will eventually still start to overheat. You know that scene in the movies where a car starts to overheat and steam starts pouring out of the sides of the hood at a rapid pace. Well, the first thing to check for is if the radiator is full. This just started happening today. When the engine is switched on air is filled into the radiator which extracts more heat. Re: 1996 Cadillac Concours Overheating while driving (can idle all day) Sign In So, if it is "COMBUSTION GASSES ARE GETTING INTO THE COOLING SYSTEM", the solution is replacing the head gasket?. When i accelerate to 50-60 + mph engine cools down. but when you get out on the road it cools down because their is more air moving through the radiator. She never did over heat. However, once I start coasting at a high speed, my Jetta starts to level off to a normal 190 degrees. Thanks again for all the advice I will report back after installing the new fan motor. Why does my ac blow warm air at idle and car overheats? (2007 Ford Edge) When I'm at a red light or idling or driving slow very long my ac starts blowing warm air and my engine will over heat. Not sure why 08 poniacg5? I hit some deep snow a while back, and the engine light came on. The Top 5 Symptoms of Car Overheating. The car starts and runs without any major issues*, but after around 30-45 minutes of driving on a hot day it begins to overheat. Your car's cooling system allows the engine to function at the optimum temperature by using air to keep the engine coolant cool, and distributing it throughout the engine. If your car seems to overheat in city traffic but not on the highway. Online Repair. I have a Toyota corolla, and I just replaced the radiator and the thermostat. My mazda has always ran perfectly temperature wise. (No ac/heat). Have you checked the fan fuses? With the car sitting especially if it is hot the fan(s) should be running. It seems to be worse if the AC is on, but even with the AC off and driving at 65MPH+ on the interstate it will eventually still start to overheat. That's because the water pump runs at a high enough speed to force the remaining coolant through the engine faster. the fans should come on at around 222 degrees take a look i bet they are not. It gets into your nerves and starts wondering why your car would overheat when AC is on. Hi there Austin, The A/C in my car does not blow cold when I am sitting still or going slow speeds. Did some research and read that overheating / running hot is a common problem. Car overheats at idle, but cools when moving? My car started overheating while I was stuck in traffic, I tried revving the engine a bit to see if it would cool it down but it didn't. Then call a tow truck. Here's the twist:. It will get down to about 45 at idle. What makes this really strange is it seems to cool down VERY fast. The second thing would be to make sure it isn't clogged. The car warms up and you get sort of warm air but if you put the fan higher it starts blowing colder all this time it stays in the middle between hot and cold. I can turn the A/C off and the temperature gauge almost immediately fall off to a cooler temperature. The water wetter does work, in my experience, but only by a few degrees for a street vehicle that runs 50/50 mix. I just know that after driving the car for a few days, it is still running fine, without overheating. , but cools when I drive? I have a 99 mitsubishi galant and it is overheating according to my Guage whenever I'm at a stop or a idle. 5 days ago, the car seemed to reset itself (signs: clock reset, AC now celcius, back to drive-learning mode) 3. Had it flushed and after that seemed overheating but we kept using heat to keep it cool or drove it to cool it. What to Do if Your Car Overheats While Driving Posted on March 5, 2010 by Defensive Driving Team | in Defensive Driving Tips. In normal circumstances, you will see the needle in the middle of the. If your vehicle overheats in normal weather and traffic, you may need to add liquid to the system, replace the thermostat, adjust or replace the accessory belt, or check the water pump. Tips and Tricks; My Car Overheats in Idle & Cools Down When Driving. It would basically run idle only when the A/C was on Now Autozone diagnosed the car and told me it was a battery problem, but the discount auto parts store said it was a air control sensor problem with fuel injection and air. Reservoir tank is cold at the bottom but warm on the top 6. Fix a car that overheats in. But then the heat stops and the temp goes back up. Toggle navigation Close Menu. When my car ('04 Suzuki Aerio) is idle, the compressor cuts off and the AC blows hot. This is related to the RPM and not the car moving, as it also does this while parked in neutral. You need to get water or coolant into your vehicle as soon as possible, but it's crucial not to shut your car off too soon. Why a car overheats when driving but cools at idle? check your fluids it is probably low on antifreeze and if it still does it change your thermostat that should fix the problem. When your car engine overheats, immediately pull over to a safe place on the side of the road and shut off your engine. But the modern engine has far less tolerance, with its aluminum blocks and, often, aluminum heads. 3) Let the engine run at normal idle speed for a few minutes until the indicator is within the normal, acceptable temperature range shown by the white band between “H” and. Does not overheat on Highway or Interstate. More than likely, your thermostat is stuck. Imagine you are driving on a hot summer day but suddenly your car starts overheating and you can’t use the AC. If you have an overheating problem in traffic, keep an eye on your temperature gauge. The coolant is not discolored. Radiator appears to be under-capacitied and incapable of keeping the engine cool. Carefully monitor the car cooling ability while driving to understand how it works. You may have let it idle for 10 minutes in the driveway before you left and yet here you are a few miles away with a steaming vehicle. What to do when car overheats?Well, the best thing you can do is to ask for help and call a mechanic but the safest bet is to stay prepared. Jeep overheats when idle It runs great except for when I idle for more then 30 seconds the temp gauge jumps to 260+ degrees. It's caused by a lack of spark which can be either the ECU's fault (on EFI cars), or the coil on pretty much any car. Now it blows the coldest air you think of. You know that scene in the movies where a car starts to overheat and steam starts pouring out of the sides of the hood at a rapid pace. Water should be visible at the top of the radiator. To troubleshoot a cooling system, you must first understand how the system works. I've run it for 40 minutes without overheating in the driveway, but it will soon overheat when I take her out on the road. It lacks pressure but it builds up after a while. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. It just stumps me that the car overheats when driving an its 40 out but then cools down when in neutral/stoped. Create an account Forgot your password? Forgot your username? Quietest fans pc reddit Quietest fans pc reddit. If you find yourself in stop-and-go traffic or climbing a steep grade on an extremely hot day, and your dashboard temperature indicator starts to rise or a malfunction indicator light comes on, here’s how to […]. Not only would this be. Common car heater problems explained. You will especially be able to feel the difference when you accelerate. also make shur your heater is on to get that air out as well. I would expect about the same performance from other R134A systems. My car over heats at idle then when driving it cools down anybody had this problem. Reservoir tank is cold at the bottom but warm on the top 6. Then call a tow truck. The car over-heats while driving faster and cools when driving slower but still stays at the half-way point on the gauge. Right now with the cooler weather when your car is moving the air is cool enough to cool down your engine, but at a stand still without the water circulation it would over heat. When I get on the freeway it cools ok…. I replaced thermostat. You sit and idle, no more air entering the system. The car will only overheat if I'm at a long red light or if I'm driving very slowly (<15mph) for a few minutes, it doesn't matter if the A/C is on or off. Other Causes of Car AC Not to Cool at an Idle or a Stop The car could be overheating - caused by something else other than the cooling fan. When larger issues arise and you need cooling system repair, schedule an appointment for a system diagnostic test before it's too late. There are several symptoms that you will easily notice when your car overheats. Car runs strong and sounds great 7. If i put the car in neutral, idle it or even park the car the temp immediately starts cooling down. u know, in traffic and stop lights. I just replaced my coolant last month and oil is new as well. Essentially, hot coolant is pumped through your radiator, where heat is exchanged with the air. Changed thermostat, same problem. I was told to change the pump out. If your car heater is suddenly blowing out cold air instead of heat in the middle of a bitterly cold winter, you have a good reason to be frustrated. 63 Galaxie with 390 overheats at idle. The car starts and runs without any major issues*, but after around 30-45 minutes of driving on a hot day it begins to overheat. Let's start with the 2007 Nissan Maxima overheating Problems at idle but cools down after you start driving. It gets into your nerves and starts wondering why your car would overheat when AC is on. Car Only Overheats When Driving If you have recently been stuck on the side of the road in soaring temperatures with an overheating car, you may be wondering why your car only overheats when driving. this car is equipped with an electric cooling fan, best guess is it is not working, that is why it gets hot when idling or driving around town in stop and go traffic. After putting in the new fan clutch the truck will over heat in stop and go driving after driving for about 30 minutes. You sit and idle, no more air entering the system. Want more details on keeping your classic car cool? See Jim O'Clair and Craig Fitzgerald's article "Beat the Heat" from the December 2005 issue of Hemmings Muscle Machines. What causes a car to overheat while idling like that, and should I be worried? Answer: If you car is overheating at idle, but it’s fine the rest of the time, then there are a handful of different problems that you might be dealing with. Air is still very cool when driving. the fan is supposed to come on at idle, when it's hot enough. Notice: Undefined index: HTTP_REFERER in /home/forge/newleafbiofuel. When I drive on the highway at a steady speed of 100k/h, the engine temp is normal, as soon as I slow down, or idle at a stop light the temp goes up, and it has been as high as the H mark on the dash. When i accelerate to 50-60 + mph engine cools down. okay i put in a new mr gasket 180 degree high flow race tsat, did not drill any holes yet. It is not leaking coolant and head gaskets are perfectly fine. There are many causes of engine overheating and while we won't go over all of them, we will point out some of the main causes of engine overheating and point you in the right direction […]. Lack of condenser air flow. There are several symptoms that you will easily notice when your car overheats. "My BMW overheats at idle or in stop-and-go driving. I've been trying to do a lot of research but not many threads have my exact symptoms. (No ac/heat). My car runs good when it's cold but stalls once it warms up? What gives? Well, there is an ignition problem that can cause this when the engine gets hot and it stalls. I don't drive often so it hasn't been an is. Comments: I have a 1986 560 SEC, car starts ok when cold, does run a little rough for a couple seconds and then builds rpm to normal. My car started overheating (all the way into the red on the temperature gauge). More than likely, your thermostat is stuck. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. Then call a tow truck. MechanicAdvice) submitted 1 year ago * by eqkimball44 I have recently had a hose/belt replaced and a new radiator put in (separate issues) due to overheating. Car runs strong and sounds great 7. But then the heat stops and the temp goes back up. Car overheats when driving, but temperature drops when stopped and idle. Then when I start driving again, it seems to cool down again. Worst yet is when they do go, it always at the worst possible time. In most circumstances, this fan only turns on when the car is idling and not moving because static air cannot cool the radiator effectively. Push the pedal down and if your car does not react like it used to, pauses before acceleration or accelerates irregularly it might be a sign of a leaky gasket. Check that line for slow flow at cold idle: I've had the car for a year and a half and this is how it's always looked and I. Thats the short answer. Sitting at a light it went up to about 220. I don't drive often so it hasn't been an issue but I would like to get it working properly. The answer lies somewhere in the coolant system. If they are pushing air OUT through the radiator (against the direction of travel), it'll stay cool when stopped or at low speeds, then overheat when at speed (basically, creating a "dead air" space within the radiator fins). 2013 mustang gt cooling fan resistor. It never really reaches the red and when it does it doesn't stay there long. What You Need to Know About This Article. Often times the idle will rev up a little at the same time. If your vehicle overheats in normal weather and traffic, you may need to add liquid to the system, replace the thermostat, adjust or replace the accessory belt, or check the water pump. I can start driving and the temperature gauge almost immediately fall off to a cooler temperature. If your car is running sluggish, has coolant leaks, steam, or engine malfunction, it could be overheating. Well just a few questions…car is a 1997 Oldsmobile Cutlass 3. the fan is supposed to come on at idle, when it's hot enough. Audi a4 coolant leak behind engine. I can run it on the level indefinitely, in 90-degree heat, at 60 mph, with the a. If your car continues to overheat after you've been driving for a few minutes with the heater on, pull over and cut the engine off—it's the safest and surest way to cool the engine, says Reina. Car overheats in traffic. Hot weather and older vehicles are the two main catalysts for overheating car. But the modern engine has far less tolerance, with its aluminum blocks and, often, aluminum heads. Car overheats at idle, but cools when moving? My car started overheating while I was stuck in traffic, I tried revving the engine a bit to see if it would cool it down but it didn't. While at idle, you might also press down the gas pedal to increase the pump speed and crank up the coolant flow; this. Here are some tips we've compiled to help prevent your car from overheating: Preventing Your Car from Overheating. Hot weather and older vehicles are the two main catalysts for overheating car. If i turn the heat on it does bring it down to 230. But, I wonder why you installed a 190 degree thermostat? I would have installed a 160 degree thermostat, 180 degree at most, and a high flow style if it's available for a Cleveland. On warm start, indicator continues up very slowly while driving (stops about 1/2) 6. MechanicAdvice) submitted 1 year ago * by eqkimball44 I have recently had a hose/belt replaced and a new radiator put in (separate issues) due to overheating. Good luck - let us know what you determine. after soldering the affected pipe with aluminum welding and refilled the Freon, the ac was no longer cooling at idle but when i increase the rpm it cools normal from the front vent but the roof vent not too. 1996 Cadillac Concours Overheating while driving (can idle all day) Sign In I am looking to purchase a 1996 Cadillac Concours and it will overheat while driving. Both cooling fans are functioning properly. Mechanic checked the heater core. The answer lies somewhere in the coolant system. This morning when I noticed that the coolant reservoir was low I filled it to the top (the car was cool at the time). I've been trying to do a lot of research but not many threads have my exact symptoms. If you have an overheating problem in traffic, keep an eye on your temperature gauge. Why a car overheats when driving but cools at idle? check your fluids it is probably low on antifreeze and if it still does it change your thermostat that should fix the problem. Use the windows, instead of the AC, when to cool the car. It just stumps me that the car overheats when driving an its 40 out but then cools down when in neutral/stoped. But, I wonder why you installed a 190 degree thermostat? I would have installed a 160 degree thermostat, 180 degree at most, and a high flow style if it's available for a Cleveland. My Car Overheats While Driving. But if the needle of your temperature gauge rises or you spot steam coming from under your hood, your car could be overheating. And of course overheating while driving only 8. Basically in warmer temperatures, I cannot use my air conditioning or vent air for more than a few minutes before the engine overheats, especially when I get off the highway where I have been running the air. This morning when I noticed that the coolant reservoir was low I filled it to the top (the car was cool at the time). What to Do If Your Car Overheats If your vehicle overheats, the first thing you should do is slow down and find a place to let your engine cool down, either by driving slowly or coasting. My car overheats when driving but not in idle. There is a different message that says "idle engine overheating," at this point I am very worried and I pull over and call the chevy dealership. The engine of a car can overheat due to smoke's oxygen suck, leaving its cooling system unable to properly process the engine's heat. Dailybhaskar. Its got coolant in the resevoir, so it not that its short on coolant. I guess the bottom line here is that you should immediately check all fluids and proceed with extreme caution when driving, if you don't do the safe thing and have it towed somewhere where someone who knows what they're doing can look. I went in and turned off the A/C to save fuel but when I did that, the RPM slowly decreased to zero and the car shut off. An engine that runs too hot can damage the vehicle and threaten your safety. When the water temp cools down, the thermo switch will turn off the fan. Both have GIVEN UP on fixing the. Shortly after reaching about 2000rpm, it'll turn back on and it'll blow ice cold. I'm unsure what it could be. Electrical tests of relays, wiring integrity, compression test, combustion tests; all indicate. Overheats with AC on and idleling. Changed thermostat, same problem. My Car Overheats While Driving. Create an account Forgot your password? Forgot your username? Quietest fans pc reddit Quietest fans pc reddit. Under heavy load, such as driving up long hills and/or high speeds, the temperature gauge would begin to rise, but the cabin heat would eventually begin to blow cold. I was told to change the pump out. On vehicles that use an electric cooling system, ensure the cooling fan is coming on at when the engine reaches operating temperature, usually between 195F - 220F. I did a compression test awhile back and found less than a 5% difference across the board. Reservoir tank is cold at the bottom but warm on the top 6. Causes of No Cooling During Idle and How to Solve Them 1. But what she has told me is that it over heat's at idle but not driving (I guess will be asking her that part in the morning) and she said the cooling fan does turn on (loud. What to do when car overheats?Well, the best thing you can do is to ask for help and call a mechanic but the safest bet is to stay prepared. what could it be?. In heavy traffic, let the Toyota Sienna engine idle in N (Neutral) while stopped. Why is my van overheating only at high speeds and cools down if heat is cranked up? Car overheats within 1 mile of driving no. My problem is coolant is coming out of my over flow drain tube and then when cooling down not all the coolant left in the overflow back into the system as suppose to and only seems to lose coolant when driving because when i idle in the drive way or turn it off i dont show any leaks. You may have let it idle for 10 minutes in the driveway before you left and yet here you are a few miles away with a steaming vehicle. Stay away from the engine if you see or hear steam coming from it. Car Overheating but the Coolant is Full? Low coolant is only one reason why engines will overheat. Mystery Car problems continues blows cold air and car overheats 4 Answers. Additionally, some cars have a fan clutch that may cause overheating. If your car is overheating, it can be very serious. Check that the thermostat works and opens. This will turn off the AC, which will come back on as the motor cools down. Car overheats at highway speed only! 60 and above! This is a discussion on Car overheats at highway speed only! 60 and above! within the External Engine forums, part of the LSx Technical Help Section category; Started having this problem where I would take my ride on the highway, and after about driving a few minutes. First of all car only gas 106000 miles been driving it for. anyone know why it would be doing that? any info would be great!. Turning on the AC overrides the relay and turns on the fan. In most circumstances, this fan only turns on when the car is idling and not moving because static air cannot cool the radiator effectively. It will overheat then drop back to normal asked by Brittney on March 03, 2017 My Mitsubishi Lancer says it is overheating when I drive, it only takes a trip of about 5-10 minutes for the gauge to go up, but when I idle sometimes it goes back to normal or close to normal before going up again. I just replaced my coolant last month and oil is new as well. The car starts and runs without any major issues*, but after around 30-45 minutes of driving on a hot day it begins to overheat. overheating at idle but not while driving I've got an 05 wrx and for some reason there are times where the temperature rises slightly on my gauge at idle. 63 Galaxie with 390 overheats at idle. The longer answer is a clogged raditor fins with too many bugs stuck between the fins. the other option is to make sure your fans are turning on. Right now with the cooler weather when your car is moving the air is cool enough to cool down your engine, but at a stand still without the water circulation it would over heat. Sitting at a light it went up to about 220. Hope this helps. Welcome to the club and good luck with your cooling problem. After driving 3 miles it begins to overheat. You may have let it idle for 10 minutes in the driveway before you left and yet here you are a few miles away with a steaming vehicle. there are a few other things to check. I don't drive often so it hasn't been an is. car getting hot at idle. You could let it warm up to temp, sit still open the hood and see if fans kick on to cool it. as it starts dropping add more fluid until all the air is out and the fluid is at the hot level. It might not stall immediately, but as the oxygen flowing in decreases, the vehicle may slow down and eventually stop. you have to do a cold fill, then let the car warm up and keep an eye on the fluid level. The engine goes from half way to 3/4 when idle at stop light then back down. AC blows warm at idle – F150 AC blows warm at idle – F150. The coolant is not discolored. Another thing to consider is possibly cavitation in the water pump, which would explain why it tends to overheat when the engine is running down the freeway, but doesn't help much on the lack of cooling when you let it idle again for a bit. There has not been antifreeze on the floor in my car. Jeep overheats when idle It runs great except for when I idle for more then 30 seconds the temp gauge jumps to 260+ degrees. The main goal of your car's cooling system is to remove heat from your engine block by running coolant through cooling passages and transfer that heat to the air through the radiator at the front of your car. Why does my ac blow warm air at idle and car overheats? (2007 Ford Edge) The first time it did this my car temp gauge was at hot and started smoking, I turned the engine off and got out and it looked like all the water was running out from under my car. But before you do that check and see if your water is working. All too many people know that feeling of that temperature gauge going up, especially when sitting at a stop light and hoping that you get moving in time for the air to cool your engine a bit. The car will only overheat if I'm at a long red light or if I'm driving very slowly (<15mph) for a few minutes, it doesn't matter if the A/C is on or off. Engine Cooling System.