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Old Aug 3, 2011 | 04:44 AM
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Default a/c wiring question

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.
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Old Aug 3, 2011 | 07:27 AM
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My understanding is that AC functions are dependent on the f body pressure sensor.
I just used a trinary switch to control one fan.
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Old Aug 3, 2011 | 09:06 AM
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Yes, it should, that is how mine is wired, and it brings both fans on when compressor clutch gets 12 volts....

T,

Last edited by TomM; Aug 3, 2011 at 11:16 AM.
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Old Aug 3, 2011 | 09:33 AM
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Originally Posted by garys 68
My understanding is that AC functions are dependent on the f body pressure sensor.
I just used a trinary switch to control one fan.
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.
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Old Aug 3, 2011 | 09:35 AM
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Originally Posted by TomM
Yes, it should, that is how mine is iwred, and it brings both fans on when compressor clutch gets 12 volts....

T,
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.
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Old Aug 3, 2011 | 10:06 AM
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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.
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Old Aug 3, 2011 | 11:19 AM
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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.

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Old Aug 3, 2011 | 11:38 AM
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Yea..it's coming along..
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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.
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