Yes, the pressure will vary with speed of the compressor. The low side is the suction side. When the compressor is turned off, the high and low side should read about the same. So the low side will go up and the high side will go down.

You need to adjust your idle up a bit, as IIRC, the readings are checked with the engine at idle. You may need to bleed off some freon, but since you say it stared w/5 psi, the leak will bleed it off for you.

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RRGrassi


70's Southern Pacific #5608 Fairmont A-4 MOW car

13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.

99 W210 E300 Turbo Diesel, chipped, DPF/Converter Delete. Still needs EGR Delete, 232K

90 Dodge D250 5.9 Cummins/5 speed. 400K

Gone and still missed...1982 w123 300D, 1991 w124 300D