Heater not working

Tiny
BNRANTHONY
  • 2005 CHEVROLET AVALANCHE
  • 11,600 MILES

How do I fix a heater in 2005 chevy avalanche blowing cold air when I turn on the heater it only blows cold air?

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Thursday, December 1st, 2011 AT 7:01 AM

11 Replies

Tiny
2CARPROS KEN
  • ADMIN
  • 12,124 POSTS

Hello,

It sounds like you have temperature blend door actuator that is out and needs to be replaced. Here is a guide that has a video showing you how to fix the problem.

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

Make sure hot coolant is getting to the heater core by checking the heater hoses in the engine compartment. Make sure the blend doors and temperature controls in the heater box are functioning properly.

Here are the diagrams to change the temperature air door motor (below)

Please let us know what you find.

Cheers, Ken

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Thursday, December 7th, 2017 AT 8:30 PM
Tiny
MARSHALL35@FUSE.NET
  • 2005 CHEVROLET AVALANCHE
  • V8
  • 4WD
  • 180,000 MILES

Heater blows cold air for about 20 minutes before it heats up

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Thursday, December 7th, 2017 AT 8:31 PM (Merged)
Tiny
RASMATAZ
  • MEMBER

Check the air blend door and actuator if okay could be coming from the HVAC control module itself

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Thursday, December 7th, 2017 AT 8:31 PM (Merged)
Tiny
KIDIRISH
  • 2005 CHEVROLET AVALANCHE
  • V8
  • 2WD
  • AUTOMATIC
  • 188,888 MILES

My 2005 Avalanche's heater has just stopped working? I live in South Louisiana so I don't even use it too often? Tc

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Thursday, December 7th, 2017 AT 8:31 PM (Merged)
Tiny
KHLOW2008
  • EXPERT
  • 42,102 POSTS

Can you elaborate on the problem?

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-1
Thursday, December 7th, 2017 AT 8:31 PM (Merged)
Tiny
DAMSLIM
  • 2002 CHEVROLET AVALANCHE

Heater problem
2002 Chevy Avalanche V8 Two Wheel Drive Automatic 200, 00 miles

heater not working flushed raditor

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Thursday, December 7th, 2017 AT 8:31 PM (Merged)
Tiny
GMTECH
  • EXPERT
  • 548 POSTS

Have you tried back flushing the heater core. You can try also running the vehicle and seeing if you have hot going into the heater core and seeing if you have hot coming out. If you don't the heater core is either plugged or faulty.

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Thursday, December 7th, 2017 AT 8:31 PM (Merged)
Tiny
BRIAN J DECATO
  • 2004 CHEVROLET AVALANCHE

Heater problem
2004 Chevy Avalanche V8 Four Wheel Drive Automatic 100000 miles

no heat

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Thursday, December 7th, 2017 AT 8:31 PM (Merged)
Tiny
SCOTTY DEE
  • MEMBER

Check the operation of the blend door on the passenger side below the glovebox. Verify the HVAC controller is sending commands to the blen door actuator. If the coolant level is correct, the thermostat opens and closes as it should, and the blend door works, the heater core could have debris. Does it have Dex-Cool that is older than 3 years in it?

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Thursday, December 7th, 2017 AT 8:31 PM (Merged)
Tiny
SHAKAZOOLOO8
  • 2007 CHEVROLET AVALANCHE
  • V8
  • RWD
  • AUTOMATIC
  • 140 MILES

When I turn on the heat I get cold air blowing out.

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Friday, December 8th, 2017 AT 5:04 PM (Merged)
Tiny
2CARPROS KEN
  • ADMIN
  • 12,124 POSTS

Hey Shakazooloo8,

This is a common problem, you have a blend door actuator that is out and needs replacement, here is a guide that will help you.

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

Please let us know happens so it will help others.

Best, Ken

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Friday, December 8th, 2017 AT 5:04 PM (Merged)

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