Refrigerant Type: 134A
Ambient Temp: 78
Country of Origin: United States
I have a Ford truck with a camper that the A/C cycles off and on. My guess is that it is low on 'freon'. I have gauges to use, but what pressures should I see?
Because it's a camper it sits a lot. Any words of wisdom? As always, thanks.
A/C SYSTEM SPECIFICATIONS
Compressor Type Ford FS-10 10-Cyl.
Compressor Belt Tension (1)
System Oil Capacity(2)
With Rear A/C 10 ozs.
Without Rear A/C 7 ozs.
Refrigerant (R-134a) Capacity
With Rear A/C 63-65 ozs.
Without Rear A/C 44 ozs.
System Operating Pressures(3)
High Side 130-230 psi (9.1-16.0 kg/cm2 )
Low Side 20-45 psi (1.4-3.1 kg/cm2 )
(1) Belt tension automatically adjusted by belt tensioner. Tension should be within tensioner indicator marks.
(2) Use PAG YN-12b Oil (Part No. F2AZ-19577-A).
(3) Approximate operating pressures with ambient temperature of 80ÃÂ°F (27ÃÂ°C).
I added some 'freon' to the truck. In the end my pressures were 240psi and 32psi. Is the high side too high? It was about 80 degrees out.
How old is your fan clutch? It's very common to experience high high side on trucks due to ineffective fan. That will actually convince you to undercharge it. The only way to be sure charge is proper is to remove all the refrigerant (R-134a is not "freon") and recharge by weight.
One test is to cool the condenser with a mist of water. If the high side drops a lot, there is a problem with the airflow.
Edited: Mon November 29, 2010 at 8:21 AM by mk378
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