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Pressures for an E-350 Ford?

Kolbergk on Tue November 16, 2010 12:02 PM User is offline

Year: 1995
Make: Ford
Model: camper
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.

TRB on Tue November 16, 2010 12:08 PM User is offlineView users profile

A/C SYSTEM SPECIFICATIONS
Application Specification
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 80°F (27°C).




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Kolbergk on Mon November 29, 2010 7:51 AM User is offline

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.

mk378 on Mon November 29, 2010 8:17 AM User is offline

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

NickD on Mon November 29, 2010 11:11 AM User is offline

Quote
Originally posted by: Kolbergk
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.

Assume your doors are open, AC on, blower at max, and testing pressures at 1,500 RPM, got the 80*F part. At 80*F at the stated conditions, your low side is too high with a much higher high side pressure, should be in more of the 27 PSI. Never good to assume, I would have tested the running pressures under the stated conditions, then let the engine idle to learn the low side pressures where the cycling switch determines the cycling rate. Very well possible your cycling switch is the culprit. Everyone is too quick to add "freon".

Did you install pure R-134a? Or that crap they sell at Wal-Mart? Could have really messed up your system with that extra sealer.

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