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Old 07-07-2017, 06:35 PM   #1
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A/C pressures

I have a 2004 Newmar Essex 45' dp. Can any tell me what the proper high/low pressures is for this unit for the dash A/C? I know ambient temperature will vary the pressures but need some kind of guidelines. Thanks in advance.
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Old 07-07-2017, 06:47 PM   #2
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A/C pressures are not vehicle specific, only the amount of refrigerant.

Here is a chart for 134a
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Old 07-07-2017, 06:57 PM   #3
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I have done many AC repairs, not on MH, but tractors and cars. The high side seems to work best at 180-200 psi. the low side must never draw a vacuum, if it does it won't work. 40-60 psi on the low side, should make the system work very well.
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Old 07-07-2017, 08:40 PM   #4
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Quote:
Originally Posted by CJ7365 View Post
A/C pressures are not vehicle specific, only the amount of refrigerant.

Here is a chart for 134a

Using that chart CJ7365 provided is the best (quick) way to determine if you have other problems in your system, like a blockage, malfunctioning valve, or compressor issue also.

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