Quote:
Originally Posted by clinebarger
I have a question....How are you guys sending a A/C request to the PCM without the factory control head? Or does the factory "pressure transducer" signal turn the fans on/off based on pressure, speed etc., without a A/C request?
|
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.