1997 850 glt me4.4 ac compressor won't come on

[dbooth914]

FYI, I did get my AC working.

The fix was 3 part process, and I believe all 3 were contributors to the AC failure.

1) Added freon to the system. It was suggested that the low pressure switch will not close if the system is low on freon. Static pressure measure @ 60psi or so and I'm told it should be between 100 and 125. It took 12oz to get the running pressure to 35psi which is about right when the compressor runs. I had to "hot wire" the compressor to get this done.

2) The grey wire to the compressor from the low pressure switch was broken or erratic. I had 13v into the low pressure switch, but not from the switch. Jumping the connection did not power the compressor. I replaced the grey wire and the compressor came on, with the low pressure switch jumped at the connnector.

3) Replaced the "Pressostat" or Low Pressure Switch, and all is well!

Thanks for all the help!!


Now I can get back to the endless P0455 issue...

Cheers!

--Doug