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Old 07-14-2021, 04:50 PM   #1
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Dash Air Conditioning 1994 P30 Chassis

Been rebuilding my dash air. Been having a problem identifying the "check valve" that screws into the receiver. Anybody know a proper name or better yet a part#? Also the compressor switch that screws into the high pressure line next to the evaporator.
My desicant bag broke open so I'm replacing the receiver,expansion valve and evaporator and hopefully the switch also. HELP!
When I removed the evaporator there was oil in the bottom of the case.
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Old 07-14-2021, 07:15 PM   #2
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Quote:
Originally Posted by OhioBob962 View Post
Been rebuilding my dash air. Been having a problem identifying the "check valve" that screws into the receiver. Anybody know a proper name or better yet a part#? Also the compressor switch that screws into the high pressure line next to the evaporator.

My desicant bag broke open so I'm replacing the receiver,expansion valve and evaporator and hopefully the switch also. HELP!

When I removed the evaporator there was oil in the bottom of the case.


Can you post of picture of yours? If it is the same as my 1995 I may have part numbers for you.
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Old 07-15-2021, 07:10 AM   #3
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Check Valve

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Originally Posted by RickNC View Post
Can you post of picture of yours? If it is the same as my 1995 I may have part numbers for you.
I think 1995 has 134a instead of R12.
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Old 07-17-2021, 03:46 PM   #4
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Dash Air Conditioning 1994 P30 Chassis

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.

http://acmeairparts.com/home.html

The part number for the high side pressure switch on mine is GM/ ACDelco # 15-5741
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Old 07-18-2021, 08:58 PM   #5
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[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?
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Old 07-18-2021, 08:59 PM   #6
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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?
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Old 07-22-2021, 10:05 AM   #7
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Dash Air Conditioning 1994 P30 Chassis

Quote:
Originally Posted by OhioBob962 View Post
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?


Iím not sure what the official recommendation is , but I did use teflon tape on the sensors but not on the check valves Since they had an oring.
Hopefully you will be doing the vacuuming and recharging yourself? Even after buying the gauges and pump I came out about even coast wise for what the local. shops wanted. Bonus was the job was done right the first time!
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Old 07-23-2021, 10:36 AM   #8
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When I replaced my compressor , I flushed the system several times while it was apart with cleaner made specifically for A/C units. I used nitrogen to blow out any remaining cleaner. After the system was connected I used a vacuum pump and flushed it with nitrogen a couple of more times. I then added the correct amount of oil and charged the system. It's been trouble free for 5 yrs now.
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