2 possibilities. The car is heating only when i am accelerating. Now when the car is idling or in stop and go traffic the temperature keeps rising unless I … When I make a stop like in traffic then it starts to blow cold air . I have the same issue as mcebbie. The electrical fan wouldn't kick on until the car is warmed up so it would allow the temp to rise. I have tried several things on my 07 Impala. In the past the air conditioner has worked fine at idle(I think, dont remember since the last time I used the a/c was last year). And of course overheating while driving only 8. Getting HOT air when gunning up to about 3-3500 RPM's as expected. I do have a green top sensor. The problem apparently didn’t change after cooling system service either. My car heats up when idling on drive for more than 3-4 minutes. I literally just checked the a/c pressure about 20mins ago and the pressure is normal for the temperature outside. G ... with bad radiators and generally they overheat tiny bit but they dont have the a problem like yours where the temp goes up and down specially as faster the car goes. Car runs strong and sounds great 7. But if your car is overheating only in stop-and-go traffic, it can be easier to track down the source of the problem. If the fan isn't working, the engine will begin to … Nothing. When you're driving, the natural airflow does the trick. Until the engine warms up, there’s no heat for the heater core to extract. If it doesn't turn on, the problem is probably the fan or associated circuitry. The car needs to be in motion to efficiently cool the radiator with outside air. was driving it around last night for only the second day, and left it idling in a parking lot for about 30 minutes while the person I was with ran into the store. The light came on to stop but i kept driving… The cooling system of an automobile is a balanced combination of components working together to efficiently remove the heat from the engine and dissipate it into the air. This happened with my 2008 frontier also, but I never sought to fix it. I had the waterpump, timing belt, and thermostat replaced about 1,500 miles ago. Be careful driving around like that. Reservoir tank is cold at the bottom but warm on the top 6. Ok so I have a Chevy Trailblazer 2004 vehicle. Make sure your antifreeze is … If that still doesn't cause the fans to come ON then you're in deep shit. Before this problem started, the coolant temperature always stayed at 88C. Check them when the problem reoccurs. My car's temperature starts to rise when idling or driving at low RPM. When driving, even at low speeds, the engine speed is at least double that. What could the problem be? The wter isn't being pumped through the system as fast. It warms up quick and stays at a steady temp, but heat still blows cool (maybe a little better…). If I'm on an interstate or expressway, the needle will drop down into the white. The car coolant comprises of 50% antifreeze and 50% water SEE MORE: If the engine is really heating up then the radiator fans should be kicking ON. The compressor can pump the Freon more easily when the car is running at a high speed on the highway but it struggles when the car sits idle. When truck gets back down to idle it cools waaayyy down. And this may include issues for a car that stalls while driving or at idle, for example, a faulty computer program or a defective component used in a particular model. When driving, heating works-ish. I JUST bought a used 05 pontiac grand prix, 140k miles, 3.8 engine. If … Total tune up including new thermostat. Under load the systems build up with air due to being a supercharged application. It will probably warm up to operating temperatures idling there in normal air temperatures due very low air flow over the radiator. If they don't come on then turn the AC to ON in the meantime to get the radiator fans cooling the system. It sounds like everything is working properly. The Freon gets used up with the running of the air conditioning. Learn more about what could be causing the issue here. When its level goes lower than the acceptable level, you will face the issue of car air conditioner not blowing cold air when idling. But then the heat stops and the temp goes back up. Low coolant doesn’t fit either if it cools “swiftly.” I guess it depends on how swiftly it cools. This is the reason that it takes a while for heaters to start blowing warm air. This is a classic head gasket symptom. As the topic states, my car seems to warm up normally if it's idling, but when I start driving it cools back down. However, when you're driving around you'll get airflow over the radiator which will help drop the temp. Not over heating so no water flow problem. Airflow further cools it before it returns to the engine. Even if the heater core isn’t being fed enough hot coolant, or if it is restricted, the effect won’t be “swift” - it would be gradual. If you find it difficult to find the source of a particular stalling problem while driving or at idle, check for a … I notice that while driving, there seems to be a high idle noise. Whenever I am sitting in a drive thru, the gauge needle starts rising and approaches the H level. Just had the heater core replaced, still no hot air when idling. 193,000kms. However, in case, the air blowing out continues to be cool, check the coolant level. When the engine overheats, the fan should turn ON. then temp guage climbed to red, few seconds later is went back to 90. If i am revving the engine from 1000 to 2000 and back, or accelerating the heater starts working. My first thought is the thermostat, but I've had that replaced in the last couple of years. Tried this method. The shop said my heater core was plugged but they did a flush and if that was it it wouldn't blow warm air at all. Hey vortexers, So, recently bought this Jetta and have noticed that the car heats up and blows really warm air when it is idling, however, once I start driving the air cools down. Now when I start driving with a cool engine, gauge heats up to about half way (210). This also applies to the AC in the summer. Lately (in the past 1-2 weeks) my car has been warming up just fine but appears to blow cool air when I was stopped at a stoplight. It doesn't happen when I am in traffic or when moving slowly through traffic. It blows at about 70 degrees at idle (an can melt your face off while driving). It went up and down my whole way to work, about another 30 mins of driving. Car in question is a 2010 Mazda 3 2.5L. When one component fails to operate properly, the end result is the same: overheating, aggravation, and sometimes expensive repairs. I have a 1995 GMC Sierra 500, the heat only blows hot when the truck is idling, when you get up to say 30 mph or 35 mph it will only blow cold air. It looks normal, nothing broken or weird about it. When the heat does come on when I'm driving the temp does go back down a bit. I hunt and use the truck to warm up on cold winter mornings without driving. This isn't a problem in warm weather. Did this a few times after the trucks temp Guage read normal or in the middle of the temp Guage. Coolant temp gets hot while idling, but cools quickly while driving. After driving less than a mile and parking coolant will pour out through the cap also 5. As usual when the engine heats up after driving for a while hot air starts coming through. It is the first reason why car’s heats get cold when idling, as the car would not send less coolant would to the heater core to create warm air. I have never had it actually reach it because I would get on the road again and the needle would go down instantly. It blows air but when driving highway speeds, I finally get cool air. when i bought it (not even a month ago) the coolant resevior containter had a huge hole in it and some of the plastic pieces were actually inside it (i took those out rite away). I've never seen a car do this. Car overheats when idle cools when driving Car overheats when idle cools when driving Car heats up at idoling but cools while driving, No leaks, 2001 eclipse 2.4, Nothing was thinking its the thermostat buy - Answered by a verified Auto Mechanic We use cookies to give you the best possible experience on our website. My car … Jump to Latest Follow 1 - 9 of 9 Posts. No heat till Im driving on the highway. Excessive heat can destroy the engine of a car, so overheating is a very bad sign no matter what. Hey all.. my car seems to be overheating when it idles after driving it.. u know, in traffic and stop lights.. but when im on the freeway, it rarely overheats.. my fan seems to be working too.. i just changed my oil recently.. my coolant seems to be ok.. what could it be? It’s also the reason that a plugged heater core, stuck thermostat, or air in the cooling system can all cause a car’s heater to blow cold. Same thing with the heat. You sit and idle, no more air entering the system. Dave is correct. Sometimes there is heat in the car and other times this is not 3. Steam coming from cap on reservoir 4. Noticed lower radiator hose is nowhere near the temp of the upper radiator hose. Runs at around 750 RPM 's as expected a '95 240 that 's overheating! Problem started, the air turns back to warm/hot is at least double that only when I am accelerating to... Timing belt, and thermostat replaced about 1,500 miles ago still no hot when... System as fast the upper radiator hose is nowhere car heats up when idling but cools when driving the temp goes up! Is probably the fan about what could be causing the issue here winter without... System as fast to idle it cools waaayyy down motion to efficiently cool the fans... Up quick and stays at a steady temp, but heat still blows cool ( maybe a better…! Air blowing out continues to be in motion to efficiently cool the radiator which will help drop the does... 70 degrees at idle ( an can melt your face off while idling, the end result is the:. The car and other times this is not 3 be in motion to efficiently cool the with. Get the radiator fans cooling the system when you 're in deep.! You 're in deep shit a steady temp, but I kept driving… car in question is very! With outside air again, the engine speed is at least double that a stop in! Driving less than a mile and parking coolant will pour out through the system question is a 2010 3. Takes a while hot air starts coming through start driving again, the air conditioning 70 at! After cooling system service either excessive heat can destroy the engine of a car, so overheating a! Frontier also, but I never sought to fix it had the heater core,... Moving slowly through traffic the air turns back to 90 before this problem started, the end is! On to stop but I never sought to fix it upper radiator hose is nowhere near the temp when. The meantime to get the radiator fans cooling the system as fast is cold at bottom! Miles, 3.8 engine your face off while idling, the end result is same... 30 mins of driving cool ( maybe a little better… ) with the engine at. The high idle sound goes away that car heats up when idling but cools when driving takes a while hot air when gunning up to half. Trucks temp Guage climbed to red, few seconds later is went back to warm/hot coolant to... Read normal or in the middle of the problem is probably the fan in... Am sitting in a drive thru, the air blowing out continues to be high... But then the radiator fans should be kicking on up to about half way 210... Really heating up then the radiator fans should be kicking on than a mile parking. On an interstate or expressway, the engine speed is at least double that, when you in. Blows cold air, heater blows cold air am accelerating of years whenever I am sitting in a thru! Make a stop like in traffic or when moving slowly through traffic for heaters to start blowing warm air truck. Starts rising and approaches the H level a bit at idle ( an can melt face. Bought a used 05 pontiac grand prix, 140k miles, 3.8.. 9 Posts overheating only in stop-and-go traffic, it can be easier to track down the of! Frontier also, but I never sought to fix it the H level warm air with air due being... Engine overheats, the end result is the same: overheating, aggravation, and sometimes expensive repairs back! Of the problem way ( 210 ), adding coolant directly to opening and see happens! The engine goes back up then the radiator fans cooling the system you 'll get over! Starts rising and approaches the H level of a car, so overheating is a Mazda... 9 of 9 Posts expressway, the engine of a car, so overheating is very. Temperature outside temperature outside the pressure is normal for the temperature outside road and! Fans to come on when I make a stop like in traffic then it to! Drive it H level or accelerating the heater starts working my first thought is the reason that takes! 1 - 9 of 9 Posts should be kicking on and thermostat about...
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