Originally Posted by Dabossajk
I tried to reach Freddy, but found that his email no longer works. I'm hoping that someone can drop some knowledge on me ? My question is as follows:
I plugged in a bosch solenoid as per the instructions, and the solenoid clicks when I hit the AC button, the AC light illuminates, and the cooling fans come on (I have them set way low on the PFC when AC is active).
I'm still not getting the compressor to engage however and I've tried troubleshooting but I'm stuck: I have the pressure sensor jumpered (system isn't charged right now) and i can get compressor engagement if I jumper the AC clutch solenoid (see attached wiring diagram). So, my thought process is that the AC compressor clutch solenoid isn't getting a ground from the PFC.
It appears that the control wire for the solenoid terminates as an input at 37 into the PFC (which is pin 1L). This is where my understanding breaks down - how does the PFC control the solenoid if pin 1L is an input?
Thanks in advance for anything that you all can offer
How did you get on with this? I am having a similar issue myself.
I live in Australia and have a s8 (2001) fd with a power-fc. The wiring diagram/pinout is a little different, but AFAIK
, the wire colours have remained the same. I tested the whole system extensively as I thought my compressor clutch was the issue. Turns out the power FC is not activating the A/C relay. I traced the wire and tested it for continuity. Everything seems fine. I am tempted to just bridge the relay in the short term as it is summer here. But I would like to know if there is a more permanent solution.
I tried the relay mod on the violet wire, but this has not helped. The fans come out and it seems as if the idle is being compensated, so surely it is not too much of a stretch to get this relay to activate.
I guess I would be prepared to either wire in another relay or rewire the current relay so it activates off the A/C switch in cabin. I can always turn it off easily if driving in a spirited fashion.