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heater problems

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03-17-2014, 04:09 PM	#1
oltronj Registered User Join Date: Feb 2013 Location: worden, montana Posts: 63	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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