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First, if you’re having a problem with the A/C system on your 944, there are two ways you can approach solving the problem. The first is to just start replacing components and hope you get lucky by replacing the faulty component the first time. Before we begin with the actual troubleshooting, to properly troubleshoot the A/C system, it’s extremely helpful to understand how the automobile A/C cycle works. So, we’ll begin by discussing automotive air conditioning theory of operation. There are two basic types of automotive air conditioning systems. The type of system is determined by the device used to control the expansion of the high pressure, high temperature liquid to a low pressure, low temperature liquid. In the orifice tube system, there is an accumulator located between the evaporator and the A/C compressor suction. The accumulator has moisture removal desiccant just like the
receiver-drier used in the expansion valve system. However, it also collects any un evaporated refrigerant to prevent liquid lock of the compressor. A/C System Troubleshooting The following is an general A/C system troubleshooting guide. Realize that it is generic and many of the things listed here may not apply to the 944. Symptom : Low Compressor Discharge Pressure 1. Leak in system 2. Defective expansion valve 3. Suction valve closed. Repair :1. Repair leak in system 2. Replace valve 3. Open valve.
Tags : automotive air conditioning, faulty component, orifice tube, open valve, moisture removal, discharge pressure, system troubleshooting, expansion valve, valve system, tube system, accumulator, evaporator, receiver drier, low temperature, high temperature
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