Heater not working

DENISE WHITE

MEMBER
2004 CHEVROLET AVALANCHE
V8
4WD
AUTOMATIC
120,000 MILES

I had issues in the past where I could not get the air to come down to the vents or it would be hot air. Still having issues but now I only have cold air blowing no heat at all.

Thursday, December 7th, 2017 AT 9:28 AM

3 Replies

JACOBANDNICKOLAS

MECHANIC
109,885 POSTS

Start the engine and turn the heater on high. Allow the engine to reach operating temperature. At this point, feel both heater core hoses. Both should be hot. If they are, you have a bad blend air door actuator.

https://www.2carpros.com/articles/replace-blend-door-motor

If only one is hot and the other cold, suspect a plugged heater core. Here is a list of the most common problems:

https://www.youtube.com/watch?v=SNRb6pSwYuU

Let me know what you find.

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Thursday, December 7th, 2017 AT 6:48 PM

DENISE WHITE

MEMBER
2 POSTS

I checked the hoses one is hot the other one was barely warm.

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Sunday, December 10th, 2017 AT 3:21 PM

KEN L

MASTER CERTIFIED MECHANIC
48,363 POSTS

Yep it sounds like you have a plugged heater core. Can you remove the heater hoses and use a garden hose to blow through it please?

Here is a guide that can help you as well.

https://www.2carpros.com/articles/car-heater-not-working

Please let us know what happens.

Cheers, Ken

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Saturday, December 16th, 2017 AT 1:14 PM