Troubleshooting Car Heater Problems

February 16, 2014

Car RadiatorI'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.



Silver Feedback Medal for All Time! 270 Feedbacks
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.

Answer this Question

13 More Questions

Here are the questions asked by community members. Read on to see the answers provided by the ThriftyFun community.

December 23, 2018

How do I figure out what happened to my heater? Since my friend installed a radio now the heater doesn't work.


Gold Post Medal for All Time! 677 Posts
December 23, 20180 found this helpful

Your friend either forgot to connect the wiring to the heater or wired incorrectly. Ask him to come back and fix it.


Bronze Feedback Medal for All Time! 196 Feedbacks
December 25, 20180 found this helpful

You may want to have your mechanic double check your friend's work. It sounds like there is an unconnected or crossed wire somewhere.

Better safe than sorry on this one!


Post back what you learn!

Answer this Question

December 3, 2018

My 2010 Lincoln blows hot air only when I accelerate the engine over 2000 RPM constantly. The heater in the seat works right.


Gold Post Medal for All Time! 677 Posts
December 3, 20180 found this helpful

You may have a problem with the hearing core.


Bronze Feedback Medal for All Time! 196 Feedbacks
December 11, 20180 found this helpful

Heating and air conditioning issues are best left to a mechanic as messing with them yourself can lead to bigger and more expensive problems. When one of my cars had a similar issue, it was an easy fix, but the labor was costly.


Hopefully you have a good and trustworthy mechanic who will give you an honest price and get it done right the first time. Post back what you learn!

Answer this Question

January 3, 2017

I have a 2004 Chevy Venture. You can not turn the heater knob so it is stuck on 3 power, but only blows 1 power. The diagnostic says my thermostat and oxygen sensors are bad, would that affect the blower not working properly and the dial not moving?


January 3, 20170 found this helpful

Is the area around the dial getting warm or hot to the touch??
motor might be bad on the fan

Answer this Question

July 9, 2016

The heater/air blower is stuck on defrost mode.

Answer this Question

January 14, 2016

I have a 1988 Ford van. I don't know why no power is getting to the heater blower. It doesn't work, but will when hot wired.


Gold Post Medal for All Time! 677 Posts
October 1, 20170 found this helpful

Some reasons your heater may not be working properly

  • Low coolant level on a vehicle due to a coolant leak.
  • Thermostat that is stuck open.
  • Plugged or leaking heater core.
  • Advertisement

  • Heater blower that is not functioning.
  • Blend doors that are not functioning
Answer this Question

January 9, 2016

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


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.

Answer this Question

May 29, 2015

The AC/heater fan works correctly, but does not change the temp to hot or cold. Nor does the air compressor come on.


Silver Post Medal for All Time! 255 Posts
December 2, 20170 found this helpful

It seems that you need to replace the thermostat. You don't state if this is for a vehicle or in your home. We need a bit more information.

Answer this Question

February 9, 2014

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.


Silver Feedback Medal for All Time! 337 Feedbacks
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.

Answer this Question

January 15, 2014

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


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.

Answer this Question

January 19, 2015

I have a '98 Mazda B3000. How do I get air out of the cooling system to make the heater work? It stays cold after and while driving over 50 miles at a time after replacing the water pump and thermastat and trying to bleed air by cap and hoses to heater core. What's next?

By Keith from Powelton, WV

Answer this Question

January 12, 2015

My blower motor will not run except on low. I can unplug the relay and replug it and the blower motor will run only in the hi position. If I turn the switch to any other setting it stops blowing and will not restart unless I unplug the relay and plug it back in with the switch setting on hi. I have replaced the relay, resistor, and the switch and nothing works

By Johnny from Jackson, TN

Answer this Question

November 6, 2014

My 2000 Hyundai heater only blows on floor or on vent, but not on defrost.

By Wayne

Answer this Question

January 5, 2017

This is a page about car heater blowing cold air. When your car does not warm up with the heater on, the thermostat may be stuck or the coolant may be low.

Car heater vent and controls.

Consumer Advice Cars Repair AdviceJanuary 24, 2014
Valentine's Ideas!
St. Patrick's Ideas!
Birthday Ideas!
Better LivingBudget & FinanceBusiness and LegalComputersConsumer AdviceCoronavirusCraftsEducationEntertainmentFood and RecipesHealth & BeautyHolidays and PartiesHome and GardenMake Your OwnOrganizingParentingPetsPhotosTravel and RecreationWeddings
Published by ThriftyFun.
Desktop Page | View Mobile
Disclaimer | Privacy Policy | Contact Us
Generated 2024-01-22 14:34:20 in 11 secs. ⛅️️
© 1997-2024 by Cumuli, Inc. All Rights Reserved.