HVAC stuck on defrost, won't change mode?? : 2000-2005 (other than GXP)

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HVAC stuck on defrost, won't change mode??

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3800Charged

Post subject: HVAC stuck on defrost, won't change mode??

Posted: Tue Oct 11, 2011 10:37 am

SLE Member

Joined: Thu Aug 18, 2011 12:50 pm
Posts: 59
Year and Trim: 2003 Silver SSEI

Iv done some research and iv pulled half my pass side dash apart, can somebody tell/ show me where to find the vacuum lines that control this, I'm assuming this is the problem. Any info greatly appreciated! Thanks

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DCJREDLINE

Post subject: Re: HVAC stuck on defrost, won't change mode??

Posted: Tue Oct 11, 2011 10:47 am

Posts like an LN3

Joined: Tue Sep 20, 2011 7:58 pm
Posts: 547
Year and Trim: None

Someone else posted about their car being stuck on one setting and he found a bad fuse under the rear seat. Maybe you will be as lucky?

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3800Charged

Post subject: Re: HVAC stuck on defrost, won't change mode??

Posted: Tue Oct 11, 2011 10:58 am

SLE Member

Joined: Thu Aug 18, 2011 12:50 pm
Posts: 59
Year and Trim: 2003 Silver SSEI

Really? How do I get to said fuse lol iv only had the car about 3 months so excuse the newb questions lol

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steelmanwy

Post subject: Re: HVAC stuck on defrost, won't change mode??

Posted: Tue Oct 11, 2011 11:02 am

SLE Member

Joined: Tue Dec 07, 2010 12:39 pm
Posts: 52
Location: Greybull, WY
Year and Trim: '03 SE, Galaxy Silver

Pull up on the front edge of the back seat, it pops out...

Go down to the third post for vacuum controller location and diagram.

http://www.pontiacbonnevilleclub.com/fo ... les#p27612

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Last edited by steelmanwy on Tue Oct 11, 2011 11:11 am, edited 1 time in total.

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3800Charged

Post subject: Re: HVAC stuck on defrost, won't change mode??

Posted: Tue Oct 11, 2011 11:31 am

SLE Member

Joined: Thu Aug 18, 2011 12:50 pm
Posts: 59
Year and Trim: 2003 Silver SSEI

Thanks for the link, I think iv seen that post but isn't that for an older model, I have a 03 is there a difference?

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steelmanwy

Post subject: Re: HVAC stuck on defrost, won't change mode??

Posted: Tue Oct 11, 2011 11:50 am

SLE Member

Joined: Tue Dec 07, 2010 12:39 pm
Posts: 52
Location: Greybull, WY
Year and Trim: '03 SE, Galaxy Silver

Oops, you are right. There is no vacuum controller (thus my confusion), there are electric actuators that move the valves. They are on the sides of the case - the mode valve actuator is on the drivers side. I've never done it so maybe someone else can give you some insight. Here is an exploded view - #33 is the mode actuator.

http://www.genmotorinfo.com/Picture.asp ... SM%2c+(CJ2)+-+MH09027

_________________
......
Kurt
......
'03 Bonneville SE
'07 Yukon XL
'00 K2500 Crew

Last edited by steelmanwy on Tue Oct 11, 2011 11:53 am, edited 1 time in total.

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3800Charged

Post subject: Re: HVAC stuck on defrost, won't change mode??

Posted: Tue Oct 11, 2011 11:57 am

SLE Member

Joined: Thu Aug 18, 2011 12:50 pm
Posts: 59
Year and Trim: 2003 Silver SSEI

Thank you sir!!! Hopefully someone whose done it before chimes in

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3800Charged

Post subject: Re: HVAC stuck on defrost, won't change mode??

Posted: Tue Oct 11, 2011 5:38 pm

SLE Member

Joined: Thu Aug 18, 2011 12:50 pm
Posts: 59
Year and Trim: 2003 Silver SSEI

U think it needs to be replaced?

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00Beast

Post subject: Re: HVAC stuck on defrost, won't change mode??

Posted: Tue Oct 11, 2011 5:42 pm

Retired Site Developer

Joined: Tue May 27, 2008 10:30 pm
Posts: 20960
Location: MN/IA
Year and Trim: '17 Silverado 1500

Check those fuses, it was #33 IIRC on the other car that had this problem last week.

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Portal » Board index » Mechanical and Maintenance (no chat or performance) » 2000-2005 (other than GXP)

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