Heater problems

2007 CHEVROLET UPLANDER
164,339 MILES
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T. R. KING
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  • 4 POSTS
Fan blows up front but no heat or defrost heat. Back blows heat.
Oct 2, 2019 at 10:13 AM
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ASEMASTER6371
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Good evening.

You have separate heater cores for the front and the rear.

I would check the hoses at the firewall where they go into the truck and make sure they are hot. Check both hoses and let me know.

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

Also, with the engine off, key on, command heat and then cool and see if you can hear the actuator motor working in the dashboard.

Roy
Oct 2, 2019 at 3:56 PM
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T. R. KING
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  • 4 POSTS
I will check all and let you know. Thanks!
Oct 2, 2019 at 9:14 PM
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ASEMASTER6371
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You are welcome.

Always glad to help.

Roy
Oct 2, 2019 at 9:46 PM
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T. R. KING
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  • 4 POSTS
Motor off key on I hear faint clicking when demanding heat or cool. Do you think actuator is working?
Oct 8, 2019 at 11:33 AM
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ASEMASTER6371
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No. You should hear the door move, not the motor clicking.

Roy

Removal Procedure


imageOpen In New TabZoom/Print

1. Remove the driver side knee bolster.
2. Locate the air temperature actuator (6).
3. Disconnect the air temperature actuator electrical connector (7).


imageOpen In New TabZoom/Print

4. Remove the air temperature actuator bolts/screws (1).
5. Remove the air temperature actuator (2).
6. Remove the air temperature actuator lever (3), if necessary.
Oct 8, 2019 at 1:52 PM
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T. R. KING
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  • 4 POSTS
Thank you sir.
Oct 8, 2019 at 2:26 PM
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ASEMASTER6371
  • CERTIFIED EXPERT
  • 52,796 POSTS
You are welcome.

Always glad to help.

Roy
Oct 8, 2019 at 2:29 PM