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 - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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