A/C compressor issue

[Douglas Carter]

I just replaced my compressor and evaporator and recharged the system. The compressor is working but the clutch stays engaged and won't cycle. It does disengage when the A/C if powered off. I know there is a pressure switch that might have gone bad but is there another explanation for why the compressor stays engaged? It seems strange that the pressure switch would quit at the exactly the same time I changed out the compressor. Also, would a faulty pressure switch ruin the compressor? Thanks for any help you can offer.

Doug C

 

[John McVicker]

I'm interested in your outcome, I have a thread going now in the 60 section. I've got a different but somewhat similar issue.

The clutch not disengaging could mean low refrigerant, are you sure you put enough it ? If it's low the clutch won't cycle as it should when you have the AC on.

John

 

[1972FJ55]

Try this, put the fan on the lowest speed, close the doors and windows, run the engine at 1500 rpm and see if it doesn't cycle off. How much R134a did you put in?

 

[Douglas Carter]

Try this, put the fan on the lowest speed, close the doors and windows, run the engine at 1500 rpm and see if it doesn't cycle off. How much R134a did you put in?

I put in about 30 oz. The compressor still won't cycle off.

I'm interested in your outcome, I have a thread going now in the 60 section. I've got a different but somewhat similar issue.

The clutch not disengaging could mean low refrigerant, are you sure you put enough it ? If it's low the clutch won't cycle as it should when you have the AC on.

John

I put in about 30 oz which should be more than enough to get it to cycle.

 

[KiwiDan80]

There is a thermostat in the evaporator that will cycle the compressor off when the evaporator temp gets low enough. Have you put this back in with the probe going into the evaporator coils?
If you have enough gas in the system the low side pipe(the bigger one) coming out of the evaporator will be very cold and have condensation forming on it.

 

[Tbkw01]

Was a solution ever found for this issue?