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Old 08-02-2020, 10:26 PM   #1
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Workhorse Chassis Owner
Join Date: Mar 2008
Location: Gainesville FL
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2004 Workhorse W22 air conditioner operating pressures

Anybody out there have any recommended operating pressures for the air conditioner in a 2004 W22 or similar air conditioner?

It's an R-134A system so I'm guessing 30-40 psi on the low side and 230 psi on the high side at 90 ambient but I'm wondering if the manual gives any recommendations. These pressures are probably a bit low but I don't want to run the pressures too high until I know what it is designed for.

I don't have a recovery system otherwise I'd recover it and put a factory load in it.

Also in my testing I noticed that it does not equalize very fast after shut down which could indicate a restriction however it cools reasonably well and the pressures are as noted above so I don't think it is restricted much, if at all. There might be solenoid valves in the compressor that slow or stop the equalization - I'm just use to seeing a lot faster equalization at shut down.

2005 34' Allegro Bay W22/8.1L
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Old 08-04-2020, 08:17 AM   #2
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Refer to the chart found here: R134a Pressure Chart

It is applicable to all R134a systems.
2003 34' Georgetown on W20 Workhorse Chassis. UltraRV power mods. Front Sumo Springs, Rear P32 Sumo Springs, UltraRV Track Bar.
1998 Jeep Toad.
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air, air conditioner, w22, workhorse

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