LS1MCSS

iTrader: (18)

I'm putting a 5.3 in my 85 Monte Carlo SS and will be using the a/c. If I hook up the a/c request wire from the pcm like it should be, will that make my fan come on when I turn on the a/c? I'm using a 99-02 f-body harness and f-body pcm.

garys 68

iTrader: (1)

My understanding is that AC functions are dependent on the f body pressure sensor.
I just used a trinary switch to control one fan.

TomM

iTrader: (56)

Yes, it should, that is how mine is wired, and it brings both fans on when compressor clutch gets 12 volts....

T,

LS1MCSS

iTrader: (18)

The pcm controls the a/c on an f-body system, but I have a g-body. My compressor is a fix displacement Sanden and the pcm doesn't have any control over it.

LS1MCSS

iTrader: (18)

Thanks, That's what I wanted to hear. I want everything possible to be completly automatic on this car. I didn't want to have to wire in another relay to the a/c system just to make sure the fans come on.

the_merv

iTrader: (88)

You are the wiring guru...


The PCM is setup to turn the Fans on when the AC comes on..that's a default setting. You can adjust it with HP Tuners..as in what temp you want them to come on when you turn the AC on.

LS1MCSS

iTrader: (18)

I'm getting closer to having it running. I didn't like my gauge setup so I changed that last night. They are a lot easier to see now. I have my exhaust system, but it's still laying in the corner. I just need to get it put on, get a drive shaft cut, and do a little more wiring and I could start it. It sure looks a lot better with the fresh paint.

the_merv

iTrader: (88)

Yea..it's coming along..

G-Body

iTrader: (4)

The PCM will engage the fans and bump the idle up as long as pin#17 red sees a 12v signal and red pin #55 sees a ground signal.