Quote Originally Posted by DuraBurb View Post
Hmmm, mimic the o.k. signal from the a/c controller....
That just might work but who understands the communication protocol on the GM buss so I can figure out a way to create a data packet signal that should be coming from the a/c control module. Now theres a real mystery.

Eric
Very true, wish it was a dumb sensor that simply outputted a certain voltage and/or resistance that could be fixed with resistors/etc.

Thinking in a different direction, what happens when you use the p/u AC unit? No rear air support, does that mean nothing works or just AC doesnt work? Wonder if this would be easier to overcome?