Heater problems

Tiny
T. R. KING
  • MEMBER
  • 2007 CHEVROLET UPLANDER
  • 164,339 MILES
Fan blows up front but no heat or defrost heat. Back blows heat.
Wednesday, October 2nd, 2019 AT 10:13 AM

7 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,796 POSTS
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
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Wednesday, October 2nd, 2019 AT 3:56 PM
Tiny
T. R. KING
  • MEMBER
  • 4 POSTS
I will check all and let you know. Thanks!
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Wednesday, October 2nd, 2019 AT 9:14 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,796 POSTS
You are welcome.

Always glad to help.

Roy
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Wednesday, October 2nd, 2019 AT 9:46 PM
Tiny
T. R. KING
  • MEMBER
  • 4 POSTS
Motor off key on I hear faint clicking when demanding heat or cool. Do you think actuator is working?
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Tuesday, October 8th, 2019 AT 11:33 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,796 POSTS
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.
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Tuesday, October 8th, 2019 AT 1:52 PM
Tiny
T. R. KING
  • MEMBER
  • 4 POSTS
Thank you sir.
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Tuesday, October 8th, 2019 AT 2:26 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,796 POSTS
You are welcome.

Always glad to help.

Roy
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Tuesday, October 8th, 2019 AT 2:29 PM

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