| [GMCnet] All GMC A/C dash units. For all years are not worth fixing. [message #344804] |
Wed, 03 July 2019 00:10  |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
Karma:
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Senior Member |
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Haven't read, or posted for a month. But I've just had it on trying to make the dash A/C work properly. The fallowing is what's wrong with ALL of these GMC's. Foam seals on the air control doors are gone. Vacuum diaphragms for the doors are stuck open, or closed. Vacuum lines/control dash valve, junk. Blower, and most related wires/components shot. All air ducts have turned to mush. Just not worth fixing anymore. I'll keep it the dash system for defrost only. MAYBE. Or better. Get a small dash 12V fan. Just put a Vintage Air system with a Sandon compressor in the 73 that I sold a few weeks ago. I installed it for the new owner for FREE. Tried to have the compressor run the Vintage A/C, and dash A/C. Both cooled. But poorly . YES. Some say that running both works. But the gauges say no by the readings. So now I'm disconnecting dash evaporator.
The Vintage A/C dash unit comes with brackets. That are made to hang the evaporator from the dash. These bracket will not work well in our GMC's. So I'm done with a 73/76 install kit. I'm starting to installing a Vintage Air/heat in our 78. So I'm designing 3 floor mounting brackets, and a plumbing kit for Jim K at Applied. That he can provide for all years.. These kits will make the installs simple. The new compressor is simple, light, and not over the valve cover. The Vintage A/C system is really nice. But not to simple to install now. These install kits will make it so anyone can install a complete system. I've sent Jim drawings/templets for the floor mount brackets. For 73 to 77 GMC's. Designing mounting brackets now for 77, and 78. Bob Dunahugh 78 Royale. And 4 COPO Yenkos
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