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I have a 1992 buick lesabre and my heat stopped blowing and when I'm just sitting the heat get warm in car but when I'm driving the heat is cold

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Many things. Could be bad thermostat. Head gasket out. Fan/blower relay bad/defective. Not enough antifreeze in cooling system. Check antifreeze for level and strength ith tester. Have to take radiator cap off first, but do it when vehicle is cold. Do you know how to change a thermostat? don't attempt if never done before. Pressure test cooling system or take to autozone/advance auto/o'riellys to have pressure tested. This will tell if your head gasket is blown. You can buy a cheap 5-ball antifreeze tester and check the coolant condition. One more solutions. Coolant system may have to be burped. Possible vapor lock in coolant system if antifreeze change recently and not burped properly.

Posted on Jan 16, 2013

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Posted on Jan 02, 2017

fwadley
  • 482 Answers

SOURCE: airconditioner suddenly stopped blowing cold air while I was driving--blows warm air now

you can get a recharge kit at Auto Zone, the car has to be runnung to fill it. . This is the first thing I would do, to see if it's out of freeon first.

Ask the Auto zone man to come out side and help you refill it. They will help if you ask.

Posted on Nov 06, 2008

dgjtex
  • 405 Answers

SOURCE: After car heats up (slow to heat) it stil blows cold until moving

http://www.fixya.com/cars/t1386554-91_ford If this doesn't help you tell me more, if it does, please vote me fixya, otherwise please do not give me any rating at all, the only compensation I get is my Fixya score, Merry Christmas.

Posted on Dec 22, 2008

  • 1 Answer

SOURCE: Heater blows cold air unless accelerating

See my posted question under 2001 Mercury Villager: "HEAT BLOWS COLD WHEN CAR IS IDLING" I got an answer from chuck943 about air pockets and it was very helpful.

Posted on Feb 25, 2009

  • 1 Answer

SOURCE: 2000 buick lesabre 3800 has

I had same problem on 2000 Lesabre blowing cold on passenger and warm on driver. I fixed it by adding more freon even though it had 28 pounds of preasure. Now it works great!

Posted on May 22, 2009

johnjohn2
  • 5763 Answers

SOURCE: 1999 Buick Regal blows warm air on one side of the car and cold

may have a bad blend air door actuator.

Posted on Oct 03, 2009

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My 2000 Buick LaSabre's heater warms the car when I start it and let it sit running, but cools off again while driving. What might be the reason?


Does you car have a thermostat? If the thermostat between the radiator and engine was removed instead of replaced then the warm water (which gives you heat via a coil under your dash) inside the block rushes to the radiator and gets cooled faster than the engine can reheat it. This rapid heat transfer doesn't happen while the car is idling because no air is flowing through your radiator to cool the water.

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This sounds like the blend door actuator. This is a little door in the vent box down under the passenger side dash that opens and closes to change the vent temperature from heat to a/c. It is a little motor that opens the door. It tends to stop working due to the elements that it is in. I hope this helps!!! Thanks!!!

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Crank sensor. Next time it shuts off pour or spray some water on it then see if it will crank. If it does replace it.

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