Rear heat not working

NOSAGROY

MEMBER
2001 CHEVROLET SUBURBAN
V8
4WD
AUTOMATIC
105,000 MILES

My 2001 suburban rear heat blend door isn't working. I have tried replacing with a new rear air controller and also a new blend door actuator. The blend door does not seem to be stuck because I can manually rotate the door quite easily and then get hot air. However, when I turn the air/fan off the blend door goes back to the default position and then I get cold air again. What could be causing the problem?

7 Replies

JACOBANDNICKOLAS

MECHANIC
108,269 POSTS

Is it vacuum actuated?

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Sunday, November 28th, 2010 AT 5:37 AM

NOSAGROY

MEMBER
4 POSTS

I don't think so. It looks to be all electric controls

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Sunday, November 28th, 2010 AT 5:55 AM

JACOBANDNICKOLAS

MECHANIC
108,269 POSTS

Okay, check to see if the blend actuator is getting power. (Sorry I had to ask. It seems like they change things every 5 minutes.)

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Sunday, November 28th, 2010 AT 7:16 AM

NOSAGROY

MEMBER
4 POSTS

I'm not the best at electrical systems, but I think it is getting power. I took the actuator off and when I adjusted the temperature the gears moved on the actuator. - I did some other research over the weekend and saw someone post that they had a similar problem and needd to have the computer reset. Does this sound possible? They said it had to be done at the dealership though. Is this true?

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Monday, November 29th, 2010 AT 7:44 PM

JACOBANDNICKOLAS