AC Control Not working - The 1947 - Present Chevrolet & GMC Truck Message Board Network

kcsa75 · 10-10-2011, 05:47 PM

Now that the worst of the hot weather is behind us here in the Midwest, I've decided it's time to see if we can get the AC working.

The previous owner said the control in the dash quit working and somebody installed a jumper to turn the AC on and off. I would like to see if this can be fixed, but I don't really know where to start.

How does the heater/AC control work. What happens when you push the levers around that makes the heat/def/ac come on and off?

Thanks in advance.

**john** · 10-10-2011, 06:28 PM

Does this help?

Andy4639 · 10-10-2011, 06:28 PM

There is a push button connected to the bottom lever that when you select it all the way to the left it suppose to push the button in and the compressor turns on.

JimKshortstep4x4 · 10-10-2011, 07:51 PM

The electrical switch that turns the compressor on is attached to the diverter box and is activated by a lever via a cable. Here is a picture of the diverter box and other parts of the AC . The diverter box is the box hanging down with the push button switch attached to it.

Jim

10-10-2011, 05:47 PM	#1
kcsa75 Registered User Join Date: Oct 2010 Location: Kansas City Posts: 3,590	AC Control Not working Now that the worst of the hot weather is behind us here in the Midwest, I've decided it's time to see if we can get the AC working. The previous owner said the control in the dash quit working and somebody installed a jumper to turn the AC on and off. I would like to see if this can be fixed, but I don't really know where to start. How does the heater/AC control work. What happens when you push the levers around that makes the heat/def/ac come on and off? Thanks in advance. __________________ Willie Swamp Angel Truckers '72 C10 Highlander *People who blindly follow a GPS end up on television programs on The Weather Channel. Some survive, some don't.*

10-10-2011, 06:28 PM	#2
john member #16 Join Date: Dec 1999 Location: Yuba City Ca. Posts: 3,618	Re: AC Control Not working Does this help? Attached Images __________________ john http://67-72chevytrucks.com/vboard/showgroups.php board vendors http://www.flickr.com/photos/1745471...7602865984234/

10-10-2011, 06:28 PM	#3
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,936	Re: AC Control Not working There is a push button connected to the bottom lever that when you select it all the way to the left it suppose to push the button in and the compressor turns on. __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

10-10-2011, 07:51 PM	#4
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Re: AC Control Not working The electrical switch that turns the compressor on is attached to the diverter box and is activated by a lever via a cable. Here is a picture of the diverter box and other parts of the AC . The diverter box is the box hanging down with the push button switch attached to it. Jim Attached Images __________________ 1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end 1965 Impala SS 400 sbc, Muncie rock crusher 1966 Impala SS 396 bbc, TH 400 1969 El Camino, 350 sbc, TH 350 1971 Snowplow built on a Blazer frame 1972 GMC Short bed, stepside, TH 400, 427 BBC



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