Will 85 heater control work in 81 K5 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

TC70C10 · 05-22-2003, 08:21 AM

Are these two interchangeable. The 81 had add-on air installed at the dealer when new. Controller had a/c, heat and defrost. Phantom dually has one from a 85 with a/c, vent, bi-level etc.

Has anyone swapped these out? I don't care if everything works, but would like a/c, heat and defrost.

Thanks

**old Rusty C10** · 05-22-2003, 09:25 AM

pull yours out if they look the same they will work ( i never had dealer installed air but im sure its the same setup)

78SilveradoSWB · 05-22-2003, 11:19 AM

I believe there was a change in the heater/AC controls in the 1983. I had sold one recently from an 85 and when I did some research on it, it fits only 83-87 models. I was going to use it on my 78, but realized it used vacumn lines versus linkage and the lens was shorter. In catalogs, they go from 74-80, 81-82, 83-87 which tells me there are difference between years. Hope this helps you.

TC70C10 · 05-22-2003, 11:35 AM

Thanks Mitch, That's why I posted the question. I noticed in LMC that they show 81-82 and 83-87 and they don't list one for A/C in the 81-82 models. Dealer said the 81 - 82's have been discontinued.

05-22-2003, 08:21 AM	#1
TC70C10 Registered User Join Date: Nov 2001 Location: Harvest, AL 35749 Posts: 337	Will 85 heater control work in 81 K5 Are these two interchangeable. The 81 had add-on air installed at the dealer when new. Controller had a/c, heat and defrost. Phantom dually has one from a 85 with a/c, vent, bi-level etc. Has anyone swapped these out? I don't care if everything works, but would like a/c, heat and defrost. Thanks __________________ 1981 K5 Blazer 305, 4spd, 4x4, 4" Lift, custom bumpers, Warn 9.5 Ti Winch 1995 T10 Blazer 4.3L 4x4 (Son's) 2004 GMC Envoy 4.2L 2WD 2005 GMC Sierra Crew Cab Z71 4x4 5.3L 240 Fun Finder Travel Trailer Harvest, AL 35749

05-22-2003, 09:25 AM	#2
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,277	pull yours out if they look the same they will work ( i never had dealer installed air but im sure its the same setup) __________________ Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!!

05-22-2003, 11:19 AM	#3
78SilveradoSWB Senior Member Join Date: Apr 2002 Location: Beaverton, OR Posts: 1,615	I believe there was a change in the heater/AC controls in the 1983. I had sold one recently from an 85 and when I did some research on it, it fits only 83-87 models. I was going to use it on my 78, but realized it used vacumn lines versus linkage and the lens was shorter. In catalogs, they go from 74-80, 81-82, 83-87 which tells me there are difference between years. Hope this helps you. __________________ Mitch 1978 Chevrolet Silverado C 10 454 BB, TH400

05-22-2003, 11:35 AM	#4
TC70C10 Registered User Join Date: Nov 2001 Location: Harvest, AL 35749 Posts: 337	Thanks Mitch, That's why I posted the question. I noticed in LMC that they show 81-82 and 83-87 and they don't list one for A/C in the 81-82 models. Dealer said the 81 - 82's have been discontinued. __________________ 1981 K5 Blazer 305, 4spd, 4x4, 4" Lift, custom bumpers, Warn 9.5 Ti Winch 1995 T10 Blazer 4.3L 4x4 (Son's) 2004 GMC Envoy 4.2L 2WD 2005 GMC Sierra Crew Cab Z71 4x4 5.3L 240 Fun Finder Travel Trailer Harvest, AL 35749



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