AC Pressure Switch ?

[406 Q-ship]

Originally Posted by Hart_Rod

Ok, not ashamed to admit I’m not the smartest when it comes to AC stuff. I’ve installed 4 or 5 complete Vintage air setups and now I’m doing a hybrid with factory components. I probably should have thought that question through some more, but Vintage Air does offer a binary switch. How does it work? Is it placed on a different location than a factory Setup on a 93 Silverado?

Vintage Air's binary switch (or trinary) is placed in the dryer (high pressure liquid cold side) of their systems and isn't necessarily a cycling switch but a system protection switch. Most of the OEM A/C system of which I am familiar, use a low pressure side switch to control the system pressure.

For me currently I am trying to convert my 74 C10 to a different form of clutch control. I converted to R134a years ago and the system worked but after letting the truck sit while redoing the engine the refrigerant leaked out. I refilled the system again but was having issues with the main inline fuse that kept turning the blower motor off and I believe freezing up the evaporator, at that the capillary cycle switch would shut the compressor down. So I am trying to use a low pressure switch from a later truck or GM car to control the compressor but I am concerned that the R12 might not have the adjustment range needed.