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Hardtime

Hardtime 4/1/2010

2004 GMC Yukon SLT 8 Cyl 5.3L

Body & Interior

Passenger, rear blowing cold, Driver blows heat. Turn unit off/on and continues, turn vehicle off/on corrects

AC blowing hot on Driver and Cold on passenger and rear zones of three zone system with all temps set at 60 degrees.
this has occurred once before and have gone windows then turned it off upon arrival and when I went to depart again, start the vehicle it started working correctly with cold coming out all three zones. Have searched the web a little and found I am not the only one with this problem just hard time getting someone to answer this question.

5 Answers


Josh

Josh 4/1/2010

Doesn't sound mechanical, I would suggest taking it to the dealers. Yukon's are very large so there may be more than one blower, if that is the case, then maybe one of the two blowers are going bad.

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Josh

Hardtime 4/1/2010

The blowers work great and blow well at any speed. Problem is it blows hot (High Heat) and not the setting it is set to when the rest are blowing cold (in accordance with the settings).

Josh

Hardtime 4/2/2010

It has now done it again, twice today. I had to shut down the vehicle each time and restart it to get it to work right.

Axis Indy

Axis Indy 4/5/2010

The problem is most likely one or both the actuator doors sticking or broken. Needs to be replaced. Around $500.00

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deckmanASE

deckmanASE 4/14/2010

More than likely it is the drivers side temp actuator is going out of phase and needs to be replaced, yes you are right this is a common problem with these systems. Take it to someone that has worked on these issues before, if they have not repaired and worked on these before you will more than likely be asked to replace parts that are not needed and it will cost more than it should

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deckmanASE

lff7 8/3/2010

There are three temp actuators. Had the defog one replaced several years ago. Now the Right Side is stuck in the full hot position. My mechanic replaced the wrong one last year. Cost me several hundred dollars.

mcconnell9725

mcconnell9725 4/18/2010

Yes I agree I had to work on friends yesterday even same problem & done a couple of chevy trucks also the flapper doors break off the pivot pins & if the acuator is working the door wont open or close right !! I'd take to someone who knows how to repair!!

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GB07

GB07 4/19/2010

Yep, these can be a nightmare if you dont know what you are doing sometimes. Best to take it to a mechanic.

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