Troubleshooting Car Heater Problems

The weather is cold and of course your heater is not working properly. Determining the cause of the problem can be time consuming and frustrating. This is a guide about troubleshooting car heater problems.

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January 9, 2016 Flag
0 found this helpful

Why does air come out of the vents all the time except when accelerating, then it goes to the windshield?

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    January 10, 20160 found this helpful

    If you don't get the answer here call Auto Zone, they may can give you some idea as to why it's happening.

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    February 16, 2014 Flag
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    I've changed my heater core and thermostat, but I still have no heat and the temperature gauge goes up. What else should I check?

    By B.T.

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    February 17, 20140 found this helpful
    Best Answer

    What Louise said, but if you know something about what you are doing, make notes to tell the person who finally is scheduled to fix it. For several decades my husband has fixed and done autobody to the family cars. And 2 of 3 sons went to college tech for these same programs.

    Neither of my 2 sons are employed in the programs above, use the info to keep their own things working correctly. Anyway, not sure if this is winter where you are, and the urgency of fixing the car is more than in summer time. If you are starting to fix things now instead of in the fall doing a full check list, I have to shake a finger at you. Catching something that should have been maintence back then was preventable. That being said, other things happen. Did you flush your radiator when doing the things you listed? Did you get things put back in the order they came off? Often a huge mistake. My guys use their phones and take photos as they are undoing, whether rebuilding and engine/tranny or just maintenence on different family cars.

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    December 8, 2009 Flag
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    I need help with the heater in my 1989 Mazda b 2600. The heater is not blowing hot and cab is staying cold. If anybody can help with suggestions it would be great.

    By Jeff from Virginia Beach, VA

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    December 10, 20090 found this helpful

    You need a new thermostat. My car was doing the same thing.

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    December 10, 20090 found this helpful

    IF you see a sudden abrupt change in the engine temp, or if you check under the hood and BOTH the upper and lower radiator hose are not hot at operating temperature (if one is cold and one is hot) then your thermostat is not functioning.

    However, sounds like the heater core...harder to get to and more expensive, unfortunately. I would make sure that I purchase the Haynes or Chilton's manual for your vehicle (around 12 dollars) and you can trouble shoot it yourself. Also, find your friendliest parts store like Napa and beg for help! Good Luck!

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    December 10, 20090 found this helpful

    This happened to me also. I went all winter with out heat in my car! Thank heavens I live in Florida. The simple fix was water. My husband had to put water in the resivor under the hood. Hope this fixes your problem. Happy Holidays

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    December 11, 20090 found this helpful

    Same with me, just needed antifreeze or water, and I had froze all that time!

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    February 9, 2014 Flag
    0 found this helpful

    My 2002 Pontiac Aztec has an issue with heat. When it is set on window vent and or window and floor vents no heat comes out! When I set it on the vents located on the dash (where the air blows out straight at you) there is heat. I live in Minnesota and can't be without the defrosting vent with this -0 temps and wind chills. My husband says I'm crazy that can't happen. I need a logical explanation. Please help. Thanks.

    By Cindy M.

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    February 11, 20140 found this helpful

    This is likely a very simple fix for an automotive technician. Take it to a shop and have them book it in for a quick check. This is not something that you can fix yourself.

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    January 15, 2014 Flag
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    The heater motor makes a howling noise at times for few minutes or longer. Other than that it works good.

    By Ken from Penticton, BC

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    January 17, 20140 found this helpful

    Sounds like the bearing is going. Many are permanently sealed. IF you can get grease in, might be ok. Normally you have to replace everything.

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    Consumer Advice Cars Repair AdviceJanuary 24, 2014
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