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 - My Ford Golden Jubilee - by Troy Estes. This article is about my '53 Ford Jubilee and a story that starts with taking the tractor to my brother's Starter/Alternator Rebuilding shop for a wiring fix. The generator was shot as well as all the wiring. I dropped off the tractor expecting a transformation from a 6 volt to a 12 volt system utilizing the original generator housing, and a total rewiring of the whole tractor. The front end center pin bushing was worn also so I ask that they replace it if they had time. Well, that�s wha
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