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Heating system only works when im driving without stopping

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  • Cars & Trucks Master
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Check coolant level first. If OK, replace the heater core.

Posted on Dec 20, 2016

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Posted on Jan 02, 2017

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R reg toyota previa over heats. had new pressure cap n tested the head gasket so both of them are fine. is it likely to be the water pump? as its worse wen Im startin n stopping but seems fine wen Im...


It appears that you have a viscous fan hub driving the fan or should I say failing to drive the fan. The fix is to replace it . If you have electric fans then there is a problem in the temp sensor system and the fans are not cutting in on temperature The problem you state is indicated by the fact that when driving there is sufficient air through the radiator to remove the heat from the radiator ..but when driving slow there is no air flow because the fan is not drawing air through the radiator and the temperature climbs until over heat is reached . Typical indicators of fan speed problem is overheating at stop sign/lights, slow heavy traffic driving, slow up hill driving, and rapid cool down as road speed is increased , the faster the speed the cooler the motor

May 15, 2014 | Cars & Trucks

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Heat doesnt work in my jeep cherokee when driving but when sitting heat works


Put a piece of cardboard in front of the radiator. Only if it's cold out though, Usually in really cold weather, the cooling affect of the cold air circulating around the radiator keeps the fluid from getting hot enough to produce heat unless your running in park.

Dec 17, 2013 | 1998 Jeep Grand Cherokee

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Hi guys I am new on this, I will start all over, I got this big problem for me, I got this 2002 huyndai elantra gt, 1 week ago I was driving and the heat stopped working, no radiator leak, everything...


Ok, here is my take on your problem. As you may already know, it takes a car a few min. to actually warm up to operating temp. When the coolent reaches operating temp. the thermostat opens to circulate the coolent in the radiator. Now, as your drive, the air pushing against your car will actually blow some air through your heating system ducts and into the passenger compartment. Is it possible that your blower fan isn't working? Because while you are stopped, there would be no air forcing its way through your ducts, thus no heat. As your drive, your car gets up to operating temp, heats up, and the air pressure as your drive will blow some heat out into the passenger compartment? On a side note, if your thermostat is stuck in the open position, it would take it forever to warm up since it is circulating ALL the coolent even tho it isn't at operating temp. A thermostat stuck open will take 30 min or more before you actually feel any warmth, if at all in the winter.. your thermostat opens and closes constantly as the engine is running to keep it at its normal temp, usually around 160-180 degrees. If you live where it gets really cold, a thermostat stuck open likely will never get warm. If your blower motor works, and your engine don't overheat, im 98% sure its your thermostat.

Dec 05, 2013 | Cars & Trucks

3 Answers

Thermostat was stuck. i replaced it. also flushed out coolant system because the previous owner had stop leak in it and that is what was sticking t stat. after doing all that. my heat is not heating when i...


if the heat works when you are sitting still and does not when you are driving the the thermostat is bad even though you replaced it. It may be clogged again, hopes this helps Tim

Oct 24, 2010 | 1996 Chevrolet Blazer

2 Answers

93 Jetta is overheating. Changed the thermostat and the pump is working. On idle the temp stays down, but while driving rises fast.


Check to make sure there is no air in the cooling system,and make sure the cooling fans are working.The cooling fans should come on,on there own,and go off on there own,without the ac or defrost on,make sure they are off.

May 13, 2010 | 1993 Volkswagen Jetta

4 Answers

HELLO I HAVE 1995 GRAND PRIX WITH THE 3.1 MOTOR. MY PROBLEM IS IM NOT GETTING NO HEAT. THE TEMP GAGE GOES TO NORMAL WHEN ITS IDELING WHEN DRIVING GET HOT THEN WHEN I PUSH ON BRAKE OR COME TO A STOP THE...


check the fan and water pump one of these is possibly ur problem when ur at idle there is no heat load and the radiator can dissipate that when ur driving causes more heat if fan isnt working the car wont cool same if problem is water pump at idle pump may be able to move some of the hot anti-freeze but when driving may not be pumping it thru radiator to cool

Dec 22, 2009 | 2004 Pontiac Grand Prix

1 Answer

My temp gauge says my car is overheating when im at a stop but running says its normal what is going on


your cooling fan is not working it is over heating when u stop may be the fuse under the hood or fan may be out i would not drive it anymore till it was fixed could cause engine failure it is cool when u are driving because it has air blowing through it

Oct 14, 2009 | 2004 Hyundai Elantra

1 Answer

2002 audi a4 1.8t heat problem.


most likely a air bubble in your system. get it up to temp open up your reservoir use something that will fit in the opening and put coolant into it rev engine up a bit until you see bubbles coming up. when you did the engine did you replace cooling system parts like t-stat or water pump? purging the system of air will take a little while good luck hope that helps

Sep 04, 2009 | 2002 Audi A4

2 Answers

Heat when the fan blow at 2 but cold if the fan is at 3 speed


1st make sure the heated core is getting hot, do this by feeling the hoses under the hood that supply hot coolant to the core, if the inlet and outlet are hot then the core has circulation and is not the problem, check this and let me know what you find.

Nov 17, 2008 | 2004 Ford Explorer

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