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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'05 Monaco Beaver 400 Quad SLD 400hp C-9 Caterpillar
2014 Grand Cherokee, Limited, diesel
Katie-Doberman Pinscher, Tigger, yellow Tabbycat.
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