The condition you describe is about normal. On an average 75 degree day, the A/C will run about 40 on the low side and 225 to 250 on the high side. These pressures will increase on a warmer day due to expansion of the refrigerant. Normally, the low side cycling switch is set to cut out when the pressure gets below about 22 to 25. It does not come back on until it gets back up to 40 or more. When the compressor is off, the pressures will equalize as the high pressure liquid passes through the orifice into the evaporator. Most R-134a systems will also have a high pressure cutout switch on the discharge hose. This is to keep the high side pressures from getting too high. On an overcharged system, high side pressures can quickly climb to 500 or so. The best way to tell if the system is properly charged is when the return line coming from the evaporator back to the compressor should be cool and on a humid day will sweat. Then you know it is cooling.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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