AIR CONDITIONING (Description): DESCRIPTION AND OPERATION (page 3 of 13)

AIR CONDITIONING

DESCRIPTION AND OPERATION

82-5

Compressor

1 Pulley
2 Inlet connection
3 Outlet connection

4 Pressure relief valve
5 Clutch connector

The compressor circulates the refrigerant around the system by compressing low pressure, low temperature vapour 
from the evaporator and discharging the resultant high pressure, high temperature vapour to the condenser.

The compressor is attached to a mounting bracket on the engine, and is a ten cylinder swash plate unit with a fixed 
displacement of 177 ml/rev (0.19 US qt/rev). The auxiliary drive belt drives the compressor via a pulley and an 
electrically actuated clutch. Operation of the clutch is controlled by the Engine Control Module (ECM).

To protect the refrigerant system from unacceptably high pressure, a pressure relief valve is installed in the outlet side 
of the compressor. The pressure relief valve is set to operate at 34.3 to 41.4 bars (497 to 600 lbf.in

2

) and vents excess 

pressure into the engine compartment.