I have the r-12 setup in my 88 iroc. What should the pressure be on the high and low side?

 

i am not sure i let my uncle do it, but all i know is that my system only needed a can of r-12 and the compressor stopped cycling..

another test to when you have the min pressure is when the fan(s) comes during the filling process..

 

It should be about 40 on the low side, when the compresser is running.

 

The low side should be around 35psi, the high side should be approx double ambient air temp.