Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Jeep Cherokee XJ 1997.1999-2001 Approved 1999 XJ Jeep Cherokee EXJ_24A
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XJ HEATING AND AIR CONDITIONING 24 - 1
HEATING AND AIR CONDITIONING
CONTENTS
page page
GENERAL INFORMATION HEATER PERFORMANCE . . . . . . . . . . . . . . . . . 14
HEATER AND AIR CONDITIONER . . . . . . . . . . . . 2 HIGH PRESSURE CUT-OFF SWITCH . . . . . . . . 21
HEATER AND AIR CONDITIONER CONTROL . . . 2 LOW PRESSURE CYCLING CLUTCH SWITCH . 21
SERVICE WARNINGS AND PRECAUTIONS . . . . 3 REFRIGERANT SYSTEM LEAKS . . . . . . . . . . . . 22
DESCRIPTION AND OPERATION VACUUM SYSTEM . . . . . . . . . . . . . . . . . . . . . . 14
ACCUMULATOR . . . . . . . . . . . . . . . . . . . . . . . . . 4 SERVICE PROCEDURES
BLOWER MOTOR . . . . . . . . . . . . . . . . . . . . . . . . 4 REFRIGERANT OIL LEVEL . . . . . . . . . . . . . . . . 23
BLOWER MOTOR RELAY . . . . . . . . . . . . . . . . . . 5 REFRIGERANT RECOVERY . . . . . . . . . . . . . . . . 22
BLOWER MOTOR RESISTOR . . . . . . . . . . . . . . . 5 REFRIGERANT SYSTEM CHARGE . . . . . . . . . . 23
BLOWER MOTOR SWITCH . . . . . . . . . . . . . . . . . 5 REFRIGERANT SYSTEM EVACUATE . . . . . . . . . 23
COMPRESSOR . . . . . . . . . . . . . . . . . . . . . . . . . . 5 REMOVAL AND INSTALLATION
COMPRESSOR CLUTCH . . . . . . . . . . . . . . . . . . . 6 A/C COMPRESSOR (DIESEL) . . . . . . . . . . . . . . 28
COMPRESSOR CLUTCH RELAY . . . . . . . . . . . . . 6 ACCUMULATOR . . . . . . . . . . . . . . . . . . . . . . . . 34
CONDENSER . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 BLOWER MOTOR . . . . . . . . . . . . . . . . . . . . . . . 36
EVAPORATOR COIL . . . . . . . . . . . . . . . . . . . . . . 6 BLOWER MOTOR RELAY . . . . . . . . . . . . . . . . . 39
FIXED ORIFICE TUBE . . . . . . . . . . . . . . . . . . . . . 7 BLOWER MOTOR RESISTOR . . . . . . . . . . . . . . 40
HEATER CORE . . . . . . . . . . . . . . . . . . . . . . . . . . 7 COMPRESSOR . . . . . . . . . . . . . . . . . . . . . . . . . 27
HIGH PRESSURE CUT-OFF SWITCH . . . . . . . . . 7 COMPRESSOR CLUTCH . . . . . . . . . . . . . . . . . . 29
HIGH PRESSURE RELIEF VALVE . . . . . . . . . . . . 7 COMPRESSOR CLUTCH RELAY . . . . . . . . . . . . 32
LOW PRESSURE CYCLING CLUTCH SWITCH . . 7 CONDENSER . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
REFRIGERANT . . . . . . . . . . . . . . . . . . . . . . . . . . 8 DUCTS AND OUTLETS . . . . . . . . . . . . . . . . . . . 47
REFRIGERANT LINE . . . . . . . . . . . . . . . . . . . . . . 8 EVAPORATOR COIL . . . . . . . . . . . . . . . . . . . . . 46
REFRIGERANT LINE COUPLER . . . . . . . . . . . . . 8 FIXED ORIFICE TUBE . . . . . . . . . . . . . . . . . . . . 33
REFRIGERANT OIL . . . . . . . . . . . . . . . . . . . . . . . 9 HEATER CORE . . . . . . . . . . . . . . . . . . . . . . . . . 46
REFRIGERANT SYSTEM SERVICE HEATER-A/C CONTROL . . . . . . . . . . . . . . . . . . 37
EQUIPMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 HEATER-A/C HOUSING . . . . . . . . . . . . . . . . . . . 42
REFRIGERANT SYSTEM SERVICE PORT . . . . . 10 HEATER-A/C HOUSING DOOR . . . . . . . . . . . . . 44
VACUUM CHECK VALVE . . . . . . . . . . . . . . . . . . 10 HIGH PRESSURE CUT-OFF SWITCH . . . . . . . . 24
VACUUM RESERVOIR . . . . . . . . . . . . . . . . . . . 10 KICK COVER . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
DIAGNOSIS AND TESTING LIQUID LINE . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
A/C PERFORMANCE . . . . . . . . . . . . . . . . . . . . . 10 LOW PRESSURE CYCLING CLUTCH SWITCH . 34
BLOWER MOTOR . . . . . . . . . . . . . . . . . . . . . . . 18 MODE DOOR VACUUM ACTUATOR . . . . . . . . . 40
BLOWER MOTOR RELAY . . . . . . . . . . . . . . . . . 18 REFRIGERANT LINE COUPLER . . . . . . . . . . . . 24
BLOWER MOTOR RESISTOR . . . . . . . . . . . . . . 19 SUCTION AND DISCHARGE LINE . . . . . . . . . . 25
BLOWER MOTOR SWITCH . . . . . . . . . . . . . . . . 19 TEMPERATURE CONTROL CABLE . . . . . . . . . . 38
COMPRESSOR . . . . . . . . . . . . . . . . . . . . . . . . . 20 VACUUM CHECK VALVE . . . . . . . . . . . . . . . . . . 36
COMPRESSOR CLUTCH COIL . . . . . . . . . . . . . 20 VACUUM RESERVOIR . . . . . . . . . . . . . . . . . . . 36
COMPRESSOR CLUTCH RELAY . . . . . . . . . . . . 21
24 - 2 HEATING AND AIR CONDITIONING XJ
GENERAL INFORMATION an almost immediate control of the output air tem-
perature of the system.
HEATER AND AIR CONDITIONER The mode control knob on the heater-only or heat-
All vehicles are equipped with a common heater- er-A/C control panel is used to direct the conditioned
A/C housing assembly (Fig. 1). The system combines air to the selected system outlets. Both mode control
air conditioning, heating, and ventilating capabilities switches use engine vacuum to control the mode
in a single unit housing mounted under the instru- doors, which are operated by vacuum actuator
ment panel. On heater-only systems, the evaporator motors.
coil and recirculating air door are omitted from the On air conditioned vehicles, the outside air intake
housing. can be shut off by selecting the Recirculation Mode
with the mode control knob. This will operate a vac-
uum actuated recirculating air door that closes off
the outside fresh air intake and recirculates the air
that is already inside the vehicle.
The optional air conditioner for all models is
designed for the use of non-CFC, R-134a refrigerant.
The air conditioning system has an evaporator to cool
and dehumidify the incoming air prior to blending it
with the heated air. This air conditioning system
uses a fixed orifice tube in the liquid line near the
condenser outlet tube to meter refrigerant flow to the
Fig. 1 Common Blend-Air Heater-Air Conditioner evaporator coil. To maintain minimum evaporator
System - Typical temperature and prevent evaporator freezing, a fixed
Outside fresh air enters the vehicle through the pressure setting switch on the accumulator cycles the
cowl top opening at the base of the windshield, and compressor clutch.
passes through a plenum chamber to the heater-A/C
system blower housing. Air flow velocity can then be NOTE: This group covers both Left-Hand Drive
adjusted with the blower motor speed selector switch (LHD) and Right-Hand Drive (RHD) versions of this
on the heater-A/C control panel. The air intake open- model. Whenever required and feasible, the RHD
ings must be kept free of snow, ice, leaves, and other versions of affected vehicle components have been
obstructions for the heater-A/C system to receive a constructed as mirror-image of the LHD versions.
sufficient volume of outside air. While most of the illustrations used in this group
It is also important to keep the air intake openings represent only the LHD version, the diagnostic and
clear of debris because leaf particles and other debris service procedures outlined can generally be
that is small enough to pass through the cowl ple- applied to either version. Exceptions to this rule
num screen can accumulate within the heater-A/C have been clearly identified as LHD or RHD, if a
housing. The closed, warm, damp and dark environ- special illustration or procedure is required.
ment created within the heater-A/C housing is ideal
for the growth of certain molds, mildews and other
fungi. Any accumulation of decaying plant matter HEATER AND AIR CONDITIONER CONTROL
provides an additional food source for fungal spores, Both the heater-only and heater-A/C systems use a
which enter the housing with the fresh air. Excess combination of mechanical, electrical, and vacuum
debris, as well as objectionable odors created by controls. These controls provide the vehicle operator
decaying plant matter and growing fungi can be dis- with a number of setting options to help control the
charged into the passenger compartment during climate and comfort within the vehicle. Refer to the
heater-A/C system operation. owner's manual in the vehicle glove box for more
The heater and optional air conditioner are blend- information on the features, use, and suggested oper-
air type systems. In a blend-air system, a blend-air ation of these controls.
door controls the amount of unconditioned air (or The heater-only or heater-A/C control panel is
cooled air from the evaporator on models with air located to the right of the instrument cluster on the
conditioning) that is allowed to flow through, or instrument panel. The control panel contains a rota-
around, the heater core. A temperature control knob ry-type temperature control knob, a rotary-type mode
on the heater-A/C control panel determines the dis- control switch knob, and a rotary-type blower motor
charge air temperature by controlling an electric speed switch knob.
motor, which moves the blend-air door. This allows The heater-only or heater-A/C control panel cannot
be repaired. If faulty or damaged, the entire unit
XJ HEATING AND AIR CONDITIONING 24 - 3
GENERAL INFORMATION (Continued)
must be replaced. The illumination lamps are avail- ◦ Jabse Service Manual Search 2025 ◦ Jabse Pravopis ◦ onTap.bg ◦ Other service manual resources online : Fixya ◦ eServiceinfo