Evacuate and replace drier Frozen Evaporator Coil 1. Add refrigerant Evaporator Not Cooling 1. Low Refrigerant - low pressure switch has cut off clutch power Repair 1. Replace head gasket Compressor Not Working 1. Leaking head gasket on compressor Repair 1.
Trash in expansion valve or screen Repair 1. Center and check distance Low Suction Pressure 1. Condenser not centered on fan or too far from radiator Repair 1. Replace reed valves High Compressor Discharge Pressure 1. Example if it's 90 degrees F, high side should be no higher than 225PSI Here is a useful trouble shooting chart for systems currently running on freon R-134a Trouble shooting Low Compressor Discharge Pressure 1. High side pressure in PSI should be about 2.2 to 2.5 times outside air temperature in degrees F. The condencer is located in front of the radiator. When running the car at idle to check the freon level it is a good idea to have a water hose handy and spray water on the a/c condencer. Remember that these are a guideline and your actual temperatures and pressures will vary depending on humidity in the air and the condition of your system. Here are some general guideline for A/C system pressures and temperatures based on ambient outside temperature.
You will need a set of manifold gauges to check you freon pressure.
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