[QUOTE=RickNC;5835615]I do have those two check valves on mine, I could not find a part number for those two when I overhauled my A/C, instead I cleaned them, reused them and have not had a problem in the 3 1/2 years since.
Your best bet might be AcmeAir. They carry quite a few parts for older motorhome A/C and might at least identify it.
BTW my understanding of how P30chassis were delivered to the motorhome manufacturer is that the A/C was all GM from the compressor to the output side of the receiver/dryer.
A/C Parts Automotive and Motorhome
The part number for the high side pressure switch on mine is GM/ ACDelco # 15-5741[/QUOTE
I wasn't clear on the switch. The switch I'm talking about is located on the high pressure line next to the evaporator inside the evaporator case. I finally found the switch.
I found 1/2 of new of the "check valve" and ordered it. There is a junk motorhome at my storage lot and it has the two check valves on it. So between them all I might have everything I need.
Another question..When installing the expansion valve,Evaporator, switch and check valve do I use teflon tape on the threads? Any kind/type thread sealer?