Compressor HVAC: Description and Operation

SYSTEM OPERATION
The compressor compresses the low pressure refrigerant vapor from the evaporator into a high pressure, high temperature vapor. The Nippondenso 10PA17 Compressor is used on all models. The system uses polyalkylene glycol synthetic refrigerant oil ND8 PAG.

The compressor used on this vehicle is a Nippondenso 10PA17 R134a. This compressor uses an aluminum swash plate, teflon coated pistons and aluminum cylinder walls. One-way check valves are used to regulate refrigerant flow through the compressor.

CAUTION: A 10PA17 R-12 compressor looks identical to a 10PA17 R-134a and will bolt up to this vehicle. It is extremely important that a R-134a compressor is identified prior to using compressor in question. Check tag located on compressor for model number.

Excessive noise that occurs when the air-conditioning is being used may be caused by:
- Loose Bolts
- Mounting Brackets
- Loose Compressor Clutch
- Excessive High Refrigerant Operating Pressure

Verify the following before compressor repair is performed:
1. Compressor drive belt condition
2. Proper refrigerant charge
3. Thermal expansion valve (TXV) operating correctly
4. Head pressure is normal