[MRS-Colin]

Originally Posted by gtpvette

Your post has really struck a chord with me. My car without AC wouldn't be a whole lot of fun to commute in. I was wondering if it might be possible to put some kind of a Frankenstein system together for a short term solution. Where a manual switch controlled 12v to the clutch and a trinary switch for high/low pressure and fan control. All this assumes the blower motor might still work via the OEM switches. Don’t know about the thermostat,,,, full cold work OK for me. Then there is idle control and high rev issues. Any thoughts???

https://www.thirdgen.org/forums/ltx-lsx/738048-e38-c.html

https://www.hptuners.com/forum/showthread.php?46614-e38-A-C-Request

https://forum.efilive.com/showthread.php?8219-A-C-request-signal

You could probably get away with making the high side switch be the path to ground for the relay coil. If the high pressure switch is "activated" meaning there is too high of pressure, the clutch would disengage. It might flip around a lot at the top as the system wouldn't let the system "pressure-down" a bit before reactivating the AC clutch.