Service Manual

HVAC
5-16 627333-A
Air Conditioning System
Refrigerant Compressor
FIG. 4: Refrigerant Compressor (1)
Belt-driven and located on engine’s left front, magnetic
clutch is used to engage compressor. Compressor
separates the low and high pressure sides of system
and is basically a pump with two functions:
• Raising refrigerant temperature and pressures by
compression.
• Functioning as a pump to circulate required volume
of refrigerant and refrigerant oil around system.
See Systems Operation/Testing and Adjusting,
Refrigerant Compressor for additional information.
Refrigerant Condenser
FIG. 5: Condenser Operation
Condenser (1)
Refrigerant from Compressor (2)
Refrigerant to Orifice Tube (3)
Condenser Fan (4)
FIG. 6: Refrigerant Condenser (1)
Located in front of radiator.
Heat is transferred from refrigerant to outside air in
condenser. Transfer is in opposite direction as transfer
in evaporator coil. Fins on outside surface of condenser
are for efficient heat transfer. If refrigerant is not cooled
enough, air inside cab at evaporator coil is not cooled
sufficiently. To prevent this, good ventilation must be
provided. This makes cooling refrigerant more efficient.
Condenser consists of a number of turns of continuous
coil mounted in a series of thin cooling fins to provide
maximum heat transfer in a contained amount of
space.
Condenser receives hot, high-pressure refrigerant
vapor from compressor. The hot vapor passes through
condenser coils. Outside air is pulled through
condenser by engine fan. Heat moves from hot
refrigerant vapor into cooler outside air flowing across
condenser coils and fins.
FIG. 4
M111703002
1
FIG. 5
2
3
1
4
N011803001
FIG. 6
1
M00129