Quote:
Originally Posted by foamypirate
Yeah, mine will cycle due to to the low pressure switch being in series with the signal to the A/C clutch relay. When the pressure gets too low, it goes open to cut off the compressor, and prevent the evaporator from freezing up.
To confirm how yours is controlled, you'd need to trace the wiring. If the trigger wire to the relay is coming from the PCM, the PCM is controlling the cycling. For a 2006 PCM to do so, I believe it would need to have a serial A/C request in most cases. I have heard of a few cases where people were able to get the later PCM to accept a 12v+ A/C request, but in talking to a few tuners and harness builders, it was hit or miss on success.
If the trigger wire is coming from the low pressure switch on the accumulator (assuming you have one, and aren't using a POA valve system), the cycling will likely be controlled by that switch.
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Here's how my system is setup:
My setup:
3 wire truck pressure transducer connected to plug from Speartech harness
12volt a/c signal from the VintageAir to Speartech harness green a/c request wire
Two wire (green and black) plug to factory 2005 compressor from Speartech harness
NO binary switch (in dryer not wired)
Blue/Green PCM OS 12587811 & system 12591524
Compressor type - ANALOG