1991 S10 Issues

[philipk1965]

UPDATE....

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

Works great now, Ice cold!

[Cusser]

If the low-side running PSI is approximately in the mid-20s to mid-30s, then the pressure switch on the accumulator should be "closed," or infinite ohms on a multimeter, which would cause the compressor to engage. If a correctly functioning pressure switch senses abnormally low or high pressure, it would "open," disengaging the compressor. So the zero ohms reading that you tested means the switch is "open."

I think JohnHere mixed this up.

"Closed" would be continuity or very few ohms resistance, likely less than 1 ohm.

"Open" would be infinite resistance, no continuity.

UPDATE....
I put in 2 can of freon, pressures good L 32 H 133.
Works great now, Ice cold!

Good, don't mess with it. By the way, the pressures you posted are semi-worthless without specifying rpm (typical pressures are read at about 2000 rpm) and outside/ambient temperature.

[JohnHere]

JohnHere wrote: ↑Thu Jun 06, 2024 1:49 pm
If the low-side running PSI is approximately in the mid-20s to mid-30s, then the pressure switch on the accumulator should be "closed," or infinite ohms on a multimeter, which would cause the compressor to engage. If a correctly functioning pressure switch senses abnormally low or high pressure, it would "open," disengaging the compressor. So the zero ohms reading that you tested means the switch is "open."
I think JohnHere mixed this up.
"Closed" would be continuity or very few ohms resistance, likely less than 1 ohm.
"Open" would be infinite resistance, no continuity.

Of course! That's what I was trying to say

[philipk1965]

1800 RPM
Air temp 74 degrees F
relative humidity 54%