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My car is a 72 small block with factory air. When I got the car the compressor and many other a/c components were missing. Is there a way to tell wether or not my car used the superheat switch model compressor??
Thanks, Scott
Thanks, Scott
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Re: C3, superheat compressor switch
My recollection is all '72 Corvettes used A-6 compressors with the superheat feature. You should be able to confirm this by the presense of a 3-conductor, flat plug (called a thermo limiter) in the engine compartment AC wiring harness just upstream from the compressor's clutch pigtail.
The thermo limiter 'splits' DC power routing based on a resistor and fuse internal to the flat plug assy; one pin is the raw compressor power feed that runs through an internal safety fuse inside the thermo limiter, the second pin is a current limited (via internal resistor) power output to the compressor's superheat switch and the third pin of the thermo limiter flat pack is raw power out to the A-6 compressor clutch.
Remember, A-6 compressors with superheat feature differ from earlier/similar units. They have a 'third' hole in the back (below refigerant inlet/outlet) for the superheat switch to mount. Most of the sources for remanufactured A-6 compressors DO give you the option of ordering with or without superheat switch feature, but the last time I got one from Delco there was a 'trick' involved....
Once the Delco delivery man had dropped off the rebuilt unit and picked up the 'core', you opened the box to find a nice 'barb' note packed beneath the rebuilt compressor that read something like this:
"Dear customer, this A-6 compressor is equipped with superheat feature. Be sure you remove the actual superheat switch, gasket and mounting clip from your existing compressor before you turn it in for core credit. The superheat switch itself has LONG been a GM discontinued component."
This can be a rude shock given the generic description Delco gives for what they're selling! It can also be a turn off if you have no compressor core to start with OR the compressor core you're turning in lacked the superheat feature altogether! In either case, you're left to walk/stalk the scrapyards to obtain an actual superheat switch and mounting clip or call around secondary autoparts shops to locate a generic switch.... -
Re: C3, superheat compressor switch
Thanks for the info Jack. What would happen if my car was equipped with a superheat originally, but I used a compressor that did not have the superheat? And vise versa?
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