87 rx7 with a full turbo 2 drivetrain. I have a Microtech ECU and wired up my Air Con to the blower motor instead of the AC button on the Logicon because the ECU isn't there anymore. Recently I had an AC issue, minor leak but when we recharged it we figured out the clutch wasn't cycling off. It eventually blew one of the lines out because it was over-pressurizing. I'm looking at the wiring diagram and it shows that the Logicon puts out a 5 volt signal to the pressure switch which is an open switch and that goes to the stock ecu but because it isn't there anymore I don't think the compressor is getting the command to turn off.
so I'm trying to figure out how to wire it back up if I need too. I've been doing some research but its not making much sense to me.
Any advice is appreciated.

 

A faulty AC expansion valve can cause an AC compressor to constantly run.. . .It's cheap but you gotta deal with the refrigerant.