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Old 05-21-2022, 02:17 PM   #1
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2004 W22 AC Ports

Hi,

I have a 2005 Newmar Kountry Star on a 2004 Workhorse W22 Chassis with a chevy 8.1l engine. The Dash AC is not cooling properly, and I would like to hook up my AC Guages to determine if it is low on R134a, or if the pressures would indicate some sort of blockage.

The low side is right on the firewall at the evap core, but I am having trouble finding the high side port. When I hooked up the lowside port, the pressure went down to around 20 psi at idle, which generally indicates a low charge, but I need to compare it to the high side before adding any refrigerant.

Any hints on the high side port location??

Thanks,

Tom
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Old 05-21-2022, 02:25 PM   #2
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High side plumbing is a short run on a gas chassis ; have you had the engine cover off to check from the back of the compressor ?

Looked carefully at the receiver / dryer ?
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Old 05-21-2022, 06:44 PM   #3
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Quote:
Originally Posted by Skip426 View Post
High side plumbing is a short run on a gas chassis ; have you had the engine cover off to check from the back of the compressor ?

Looked carefully at the receiver / dryer ?
The Receiver Dryer has a pressure switch coming out of it, but no port.
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Old 05-24-2022, 11:42 AM   #4
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Ok, found the High Pressure port. It is on the high pressure line coming from the compressor, on the top right of the condenser. It was hidden behind some flexible cable conduit, so it took a bit of searching to find.

Pressures indicated that the refrigerant level was a bit low, but that the compressor was working. I added some r134a that I had in my garage to the system, and there was improvement, but thebrefrigerant level is still a bit on the low side. I will add a bit more prior to the next trip.

This serves as a reminder to run the ac system when checking on the rv during the winter months so that the seals remain swelled.

Tom
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