AC Clutch

oldave wrote:
Looking at your picture , a little farther to the left is a grey plastic
connector , behind that connector is a little square box ( thermostat )
This has a tiny copper tubing that goes into the evaporator coil ,
it's job is to keep the coils from freezing up by cutting 12v to the comp .
Two wires connect to it and can be knocked loose or the thermostat can
go bad .
Try the paper clip there and see if you get 12v to the clutch .

Thanks will try!

I know I have low pressure hence the reason I'm trying to bypass the pressure switch. Once I can get the compressor on I can get it to take a charge. I've done this many times with no issues.

Its an evans like pictured below, so I think that is the low pressure switch. I cant seem to find a high pressure one though.

Looking at your picture , a little farther to the left is a grey plastic
connector , behind that connector is a little square box ( thermostat )
This has a tiny copper tubing that goes into the evaporator coil ,
it's job is to keep the coils from freezing up by cutting 12v to the comp .
Two wires connect to it and can be knocked loose or the thermostat can
go bad .
Try the paper clip there and see if you get 12v to the clutch .

Class A motorhomes the PCM will never control the Dash AC. The Dash AC is always installed by the Coach builder and they run their own harness. The exception is a Class A Diesel pusher that the chassis builder installs the Compressor and Freon hoses from rear to front and the Coach builder installs the Evap and blower housing and dash controls and dash ductwork. The condenser is also installed by the Coach builder. On Ford/Chevy and Workhorse, the Condensor is installed by them. Your problem is what others have stated. the Pressure switches( a LOW and a HIGH) are not closing to send power to the Compressor and the Condensor fan due to low or NO charge of Freon/134a. This is a compressor saving system if you ran the compressor with no Freon/134a, it would burn the compressor up. Doug

I also think you lost the charge, picture show green on the dryer and to the right of it. Just put a gauge set on and see if you have any pressure. If you have a good charge then as stated , jump with jumper till you find the open.

ScottG wrote:
You probably have a low charge. You need to fix that first before forcing the compressor to run and destroying it.

Yes! There is a reason for the low pressure switch. Why do you want to bypass it? Have you checked for good grounds? DC power needs a place to go. Also, you are low on coolant.

Edit: On looking at your photo, . . . . again, I believe you are pointing to the high pressure switch.

Chum lee

You probably have a low charge. You need to fix that first before forcing the compressor to run and destroying it.

Try a jumper wire from a known source of 12 volt power to the fan clutch. Then you just work your way backwards with the jumper until you find the place where the power stops.