PCM needs 12v to realize AC is on, or requested on. This is what triggers both fans on LOW speed. Fans are in series through a single relay.
Resistor is only there as a bypass for the pressure switch, in the event you can't tie in to it, or it would be redundant like the vintage air.
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Originally Posted by clinebarger
I do have the 3 Relay set-up.
Now that I have a PCM with the correct Hardware, The Fans are functioning correctly with the Pressure Transducer.
I bumped the A/C off Idle table to the same RPM as the A/C on table, I have a Stall Converter so the higher RPM isn't really an issue.
If I'm understanding you correctly, A resistor will make the PCM read a fake fixed value to enable A/C Clutch Relay & Turn the High Speed Fans on anytime A/C is requested? But....Wouldn't that turn the Fans on even without the A/C request because the false refrigerant pressure signal?
My issue right now is.....My 2005 PCM will not accept a 12vdc A/C request.
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