1800 RPM
Air temp 74 degrees F
relative humidity 54%

UPDATE....

I put in 2 can of freon, pressures good L 32 H 133.

Works great now, Ice cold!

I checked the continuity of the pressure switch. It read 0.

Which is good, right?

The pressure switch either is working or not. Is there such a thing as a weak of half working pressure switch?

pick up

UPDATE!!!! The gauges on my manifold were backwards!

I did the pressure readings again.

L 37 H 85, then falls to 65 then compressor starts bring it back to 85.

Any ideas from the new readings?

Thanks!

Cusser It's still an R12 system and I put in R12.
L 65 H 50, then down to 25 with compressor on, then back to 50

JohnHere Yes the compressor was replaced many years ago. The truck has 350K on the clock.

Hi Everyone, I have a 1991 s10 with a 4.3 L The past few month the AC isn't as cold as it used to be, Naturally thought the refrigerant is low. So I charged it with one can. 14 oz. It took awhile for the can to empty and the compressor cycles on and off every 3 seconds. the AC is little bit colder n...