Compressor Replacement - Jeep J-10 Series 1982 Technical & Service Manual

reservoir to furnish refrigerant to the expansion valve at
all times. From the receiver, the high pressure liquid
refrigerant passes to the expansion valve. The expansion
valve meters refrigerant into the evaporator where a
low pressure is maintained by the suction side of the
compressor. As it enters the evaporator, the refrigerant
immediately begins to boil by absorbing heat from the
air passing over the evaporator core. Having given up its
heat to boil the refrigerant, the air is cooled and passes
into the passenger compartment of the vehicle. From
the evaporator the vaporized refrigerant is drawn back
to the compressor to repeat the cycle.
COMPRESSOR
The five-cylinder rotary compressor used on all six-
cylinder engines is shown below (fig. 3E-18).
COMPRESSOR
MOUNTING
BRACKET
42863B
Fig. 3E-18 Compressor Monntlng—Six-Cylinder Engine
COMPRESSOR MOUNTING-SIX-CYLINDER ENGINE
The mounting bracket used on the six-cylinder engine
is as follows (fig. 3E-19).
COMPRESSOR VALVE LEAK DIAGNOSIS
The compressor should be at operating temperature to
perform an accurate test.
(1) Install pressure gauge and Manifold Assembly
J-23575.
(2) Front-seat suction and discharge service valve
by turning them clockwise.
(3) Discharge refrigerant remaining in compressor
by opening suction service valve slowly.
(4) Open suction gauge hand valve and close high
pressure gauge hand valve.
AIR CONDITIONING 3E-21
(5) Start engine and operate compressor. Pressure
will build up rapidly. Stop engine/compressor at 150 to
200 pounds pressure.
NOTE: Pressure should hold if the discharge valve is
operating properly. Loss ofpressure indicates a leaking
compressor discharge valve or head gasket.
COMPRESSOR BELT TENSION
For drive belt tension procedure, refer to Section 1C.
ISOLATING THE COMPRESSOR
It is not necessary to discharge the system for com
pressor removal. The compressor can be isolated from
the remainder of the system eliminating the need for
recharging when performing compressor service.
(1) Connect pressure gauge and Manifold Assembly
J-23575.
(2) Close both gauge hand valves and mid-position
both service valves.
(3) Start engine and operate air conditioning.
(4) Turn suction service valve slowly clockwise to
ward front-seated position. When suction pressure is
reduced to zero or less, stop engine and compressor and
quickly finish front-seating suction service valve.
(5) Front-seat discharge service valve.
(6) Loosen oil check plug slowly to release any inter
nal pressure in compressor. The compressor is now iso
lated from remainder of system. Service valves can be
removed from compressor.
COMPRESSOR REPLACEMENT
Removal
(1) Disconnect battery negative cable.
(2) Isolate the compressor (see previous procedure).
(3) Remove discharge and suction hoses from com
pressor, then cover all openings with tape or plastic
plugs.
(4) Remove drive belts by loosening alternator.
(5) Remove alternator from mounting bracket and
lay aside.
(6) Remove compressor from engine mounting
bracket.
Installation
(1) Install compressor-to-engine mounting bracket.
(2) Install alternator-to-alternator mounting
bracket.
(3) Install drive belt and tighten as specified in Sec
tion 1C.
(4) Remove tape or plastic plugs from all suction
and discharge openings and install hoses on compressor.
(5) Evacuate and charge system as described under
General Information and Refrigerant Handling.
(6) Connect battery negative cable.