Have you run it long enough with the thing bypassed to confirm that the dash "thermostat" dial is shutting the compressor off when desired coldness is reached?
For 2 years I ran my system with just a toggle switch to provide power to the clutch directly. i would "cycle" the compressor on and...
If the system runs normally with this thing bypassed, you could make that bypass permanent.
My BJ does not have that device so I think it is something new-fangled to protect the system.
Its confusing if the switch is normally open but must close for the clutch to operate.
Maybe contact...
My BJ74 does not have that switch.
Does the word Coolant here mean Refrigerant/freon?
Do you think it is a fail-safe to protect the system?
When you bridged or bypassed it, did the ac clutch stay on and not release or did the clutch release according to the thermostat dial on the dash?
They do high end restorations and have secondary business rebuilding brakes and hydraulics.
I got a lifetime warranty when they rebuilt my clutch mc and booster.
White Post Restorations – Fine Automobile Restorations & Brake Cylinder Solutions - https://whitepost.com/#hometop
I bought one from...