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73-87 Chevy _ GMC Trucks => 73-87 Chevy & GMC Trucks => Topic started by: Harmon on July 14, 2010, 02:44:57 pm

Title: Turn on MAX AC but Dampers dont open
Post by: Harmon on July 14, 2010, 02:44:57 pm

AC is blowing cold, but not cold enough.  Guages show I have enough freon in the system.

Its my understanding when you have it on MAX AC, you are recirculating the cool air in your vehicle.  Well my dampers do not open to suck up the cool air in the cab of the truck. 

Anyone dealt with this?

Title: Re: Turn on MAX AC but Dampers dont open
Post by: Lt.Del on July 14, 2010, 05:44:53 pm

what do you have?  some trucks have vacuum controlled controls, some cable.

Title: Re: Turn on MAX AC but Dampers dont open
Post by: Harmon on July 14, 2010, 06:16:38 pm

Its a 1986 Silverado

Title: Re: Turn on MAX AC but Dampers dont open
Post by: TexasRed on July 14, 2010, 07:18:45 pm

SgtDel, is that what this here ball of doom is for:

http://www.autozone.com/autozone/parts/Motormite-Vacuum-Reservoir/1984-GMC-C1500-1-2ton-P-U-2WD/_/N-ik8mzZ93xvr?counter=0&filterByKeyWord=vacuum&fromString=search&itemIdentifier=439277_122285_13423_5520

Title: Re: Turn on MAX AC but Dampers dont open
Post by: shane o on July 14, 2010, 11:16:32 pm

I would also like to know the answer to this question, mine blows air but most of it comes out of the floor vent.

Title: Re: Turn on MAX AC but Dampers dont open
Post by: VileZambonie on July 15, 2010, 12:02:42 am

If the vacuum reservoir isn't hooked up it won't change modes. Check that first.