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03-17-2014, 04:09 PM
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#1 |
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Registered User
Join Date: Feb 2013
Location: worden, montana
Posts: 63
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heater problems
Does anyone have some pointers for troubleshooting the vacuum operated heater doors on a 91 GMC Suburban? Just bought it and the heater just always blows a little out of the dash almost like something is stuck but it won't change to the floor or the defrost. I know it is all vacuum operated. Just looking for some tips and tricks if anyone has any.
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03-19-2014, 10:51 AM
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#3 |
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Registered User
Join Date: May 2012
Location: Colo Springs, CO
Posts: 870
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Re: heater problems
Look at the blending door and the infamous "broken tab".....
__________________
- Jeff 89' K5 Blazer, 2.5" lift, 35" tires  04' GMC Yukon XL, 3/4 ton, 8.1L |
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03-20-2014, 09:51 AM
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#4 |
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Registered User
Join Date: Feb 2013
Location: worden, montana
Posts: 63
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Re: heater problems
Got onto it last night and found a few rotten vacuum hoses and it's working now. All I have left is to figure out why the blower won't go to high. Thinking a bad relay or something, if anyone has ideas on that I would appreciate some guidance.
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03-20-2014, 11:09 AM
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#5 | |
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Registered User
Join Date: May 2012
Location: Colo Springs, CO
Posts: 870
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Re: heater problems
Quote:
http://www.autozone.com/autozone/par...er=946055_0_0_
__________________
- Jeff 89' K5 Blazer, 2.5" lift, 35" tires 04' GMC Yukon XL, 3/4 ton, 8.1L |
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03-20-2014, 07:22 PM
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#6 |
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Registered User
Join Date: Feb 2013
Location: worden, montana
Posts: 63
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Re: heater problems
I found one at a junkyard and will give it a try thanks.
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