Quote:
Originally Posted by plumber452
I recently purchased the same harness from BP Automotive and after some lengthy searches I've found that from 03 on up the Green/Blue connectors PCM do not have an A/C request. The PCM receives its signal through a serial data line coming from the A/C Heat switch module in the dash of the original donor vehicle. It appears most people are wiring it like LS1 Nova recommends. I've read other threads where people have "Stuck" an A/C Switch module, like the one that came from the donor vehicle, under the dash and run their new A/C system through the module and out to the PCM. This way it maintains the PCM control of the fans etc. Good luck and keep us posted.
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Thanks.
I did see that here.
https://www.bp-automotive.com/air-conditioning-faq/
But honestly when I bought both the truck harness (21 circuit) and BP fuse block harness I didnt know how it all worked .... and really its overkill for what I need on the truck. Read that the factory AC is done through serial data .....
No idea why the kit I bought says "A/C Compressor Relay" .... when really they are saying the request/ac wiring should be a seperate harness.
Oh well .... moving on.
Thx all.