Help! A/C techs!

[hatzie]

Originally Posted by 87chevy.com

is the high pressure cut off and low pressure cut off all in 1 switch?
is it connected to the accumulator? if so why is it necessary to replace the low pressure switch?

high pressure cut off switch goes on the high pressure side of the a/c not the low side.

check wiring diagrams and if power goes from a/c panel to low pressure switch (if ok) it goes to compressor clutch. see if you have power going to low pressure switch.

clint

Clint,
The original factory part on a truck originally equipped for R12 is just an LPCO set for R12 refrigerant low pressure cutout.

The aftermarket replacements can be purchased with both HPCO & LPCO all in one. They're setup for R134a safety pressures so you kill 2 birds with one stone.

Originally Posted by HOGDADDY

So this is all that's needed then?

https://www.aircomponents.com/produc...tch-sw-10001c/

That's the animal you're looking for assuming your LPCO has the same Packard 56 connection type. Somewhere around this year GM started using a Metripak 150 shrouded plug on the LPCO. You can buy either type you just need to verify what you have. It'll take care of both low and high pressure safety cutout without changing the wiring at all.