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Old 08-18-2013, 10:44 PM   #1
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Workhorse Chassis Air Conditioner Refrigerant

I have a 2000 MY Fleetwood Flair Model 30H Class A Motorhome built on a Chevy/Workhorse P30 Chassis. I recently am having problems with the Chassis AC System. It isn't blowing cold like it used to. Since the coach is 13 years old, I wanted to start with the charge amount in the system and go from there. Problem is that I cannot seem to find a system charge level specification. The closest I see is info from Workhorse that says the system "starts" with a 1.5 Lb charge for the "Harrison" Condenser and Receiver Drier components and the full "System" charge level is the responsibility of the Coach Builder. Would anybody know how to get the "System" charge level specification? Any help would be greatly appreciated.
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Old 08-18-2013, 10:52 PM   #2
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Charge using the inlet and outlet temp comparison of the evap core..this will get you exact
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Old 08-19-2013, 04:43 AM   #3
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Use these numbers to determine full charge on your 134A system. For example if it is 90 degrees ambiant, then your pressures should be 45-55 psi on the low side and
250-270 psi on the high side.


R134a TEMPERATURE PRESSURE CHART

Ambient Temp (˚F)
Low Side Gauge
High Side Gauge

65˚
25-35 psi
135-155 psi

70˚
35-40 psi
145-160 psi

75˚
35-45 psi
150-170 psi

80˚
40-50 psi
175-210 psi

85˚
45-55 psi
225-250 psi

90˚
45-55 psi
250-270 psi

95˚
50-55 psi
275-300 psi

100˚
50-55 psi
315-325 psi

105˚
50-55 psi
340-345 psi
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Old 08-19-2013, 07:33 AM   #4
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This is great info. I'll give it a look, Thank you!
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Old 08-20-2013, 07:49 AM   #5
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Refrigerant Amount

I was able to call Fleetwood in Decatur and they were able to provide the factory charge information to me. They said that the proper system charge is 2.0 Lbs R134a.
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