Actually your pressures sound high, like an overcharge, to me. A lot of things come into play when recharging with just gauges : engine rpm, ambient temperature,cab temperature,windows up or down, cab fan setting speed, airflow thru evaporator(dirty or clogged cabin air filter),airflow thru condenser-engine fan on/off (if it is cycling type or constant on), and what type system- expansion valve or cycling clutch orifice tube. Then you want to measure the outlet vent temperature with a good thermometer. If I charge just using the gauges,only charge on the low side,engine rpm at least 1000-1200(close to operating condition rpm) all fans on max(engine fan locked on),with strong air flow thru condenser and evaporator , thermometer in dash vent. Charge til high side reads 175-220 and low side 30-35 and 50' duct temp if it's an expansion valve system. Now if it's an orifice tube system watch the on/off time of the clutch-should stay on longer than off=10-15 secs on then off. An a/c system is engineered to run with a measured amount of refrigerant and run a rpm that you normally run when operating.Too much reduces efficiency and strains the compressor, too little can cause oil starvation to compressor as it circulates with the freon thru the system. Also you should add a little pag oil if you replace a component :1/2 oz for a hose 1-2 oz for drier or condenser. Allan in Ne is correct:the gauges really just tell you if everything is working properly along with feeling lines (to be cold or warm where they should).Weigh in the charge for best performance and longevity. Mark
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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