Compressor HVAC: Description and Operation

SYSTEM OPERATION
The compressor used on this vehicle is a Nippondenso 10PA17 R-134a.This compressor uses an aluminum swash plate, teflon coated pistons and aluminum sleeved cylinder walls.

CAUTION: A 10PA17 R-12 compressor looks identical to a 10PA17 R-134a and will bolt up to the vehicle. The 10PA17 R-12 compressor must not be used on this system. It is extremely important that a 10PA17 R-134a compressor is identified prior to using compressor in question. Check tag located on compressor for model number.

Noise
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