Quote:
Originally Posted by ls1nova71
To send an A/C request to the PCM, you just take the wire that originally went to the compressor clutch, and wire it to the A/C request wire going to the PCM. The catch is, you can only do it on the 2002 and older systems, as the 2003 and up the request is sent via serial data. There has been some talk about being able to change certain files in the tune with Tunercat to be able to use the newer PCM with the older style 12v A/C request, but I haven't looked into it much.
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At least on my 2005 LS2 (E40 ECM) the ECM is quite happy to control the AC system pressure with the fans even though it does not have an AC request. As LS1nova pointed out, I would have to get the AC request onto the serial bus somehow. The only issue is that the ECM can't cut the compressor off in case of a pressure fault.
TR