Heating And Air Conditioning - Jeep Wrangler 1997 Manual

TJ
HEATING AND AIR CONDITIONING
page
GENERAL INFORMATION
HEATER AND AIR CONDITIONER CONTROLS . . 2
HEATER AND AIR CONDITIONER . . . . . . . . . . . . 1
SERVICE WARNINGS AND PRECAUTIONS . . . . 2
DESCRIPTION AND OPERATION
ACCUMULATOR . . . . . . . . . . . . . . . . . . . . . . . . . 4
BLOWER MOTOR RESISTOR . . . . . . . . . . . . . . . 5
BLOWER MOTOR SWITCH . . . . . . . . . . . . . . . . . 5
BLOWER MOTOR . . . . . . . . . . . . . . . . . . . . . . . . 4
COMPRESSOR CLUTCH RELAY . . . . . . . . . . . . . 5
COMPRESSOR CLUTCH . . . . . . . . . . . . . . . . . . . 5
COMPRESSOR . . . . . . . . . . . . . . . . . . . . . . . . . . 5
CONDENSER . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
EVAPORATOR COIL . . . . . . . . . . . . . . . . . . . . . . 6
FIXED ORIFICE TUBE . . . . . . . . . . . . . . . . . . . . . 6
HEATER CORE . . . . . . . . . . . . . . . . . . . . . . . . . . 6
HIGH PRESSURE CUT-OFF SWITCH . . . . . . . . . 6
HIGH PRESSURE RELIEF VALVE . . . . . . . . . . . . 6
HIGH SPEED BLOWER MOTOR RELAY . . . . . . . 6
LOW PRESSURE CYCLING CLUTCH SWITCH . . 7
REFRIGERANT LINE COUPLERS . . . . . . . . . . . . 7
REFRIGERANT LINES . . . . . . . . . . . . . . . . . . . . . 7
REFRIGERANT OIL . . . . . . . . . . . . . . . . . . . . . . . . 7
REFRIGERANT SYSTEM SERVICE
EQUIPMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
REFRIGERANT SYSTEM SERVICE PORTS . . . . . 8
REFRIGERANT . . . . . . . . . . . . . . . . . . . . . . . . . . 7
VACUUM CHECK VALVE . . . . . . . . . . . . . . . . . . . 8
VACUUM RESERVOIR . . . . . . . . . . . . . . . . . . . . 8
DIAGNOSIS AND TESTING
A/C PERFORMANCE . . . . . . . . . . . . . . . . . . . . . . 8
BLOWER MOTOR RESISTOR . . . . . . . . . . . . . . 15
BLOWER MOTOR SWITCH . . . . . . . . . . . . . . . . 15
BLOWER MOTOR . . . . . . . . . . . . . . . . . . . . . . . 15
COMPRESSOR CLUTCH COIL . . . . . . . . . . . . . 16
COMPRESSOR CLUTCH RELAY . . . . . . . . . . . . 17
GENERAL INFORMATION
HEATER AND AIR CONDITIONER
All vehicles are equipped with a common heater-
A/C housing assembly (Fig. 1). The system combines
air conditioning, heating, and ventilating capabilities
CONTENTS
HEATING AND AIR CONDITIONING 24-1
page
COMPRESSOR . . . . . . . . . . . . . . . . . . . . . . . . . 16
HEATER PERFORMANCE . . . . . . . . . . . . . . . . . 11
HIGH PRESSURE CUT-OFF SWITCH . . . . . . . . 17
HIGH SPEED BLOWER MOTOR RELAY . . . . . . 17
LOW PRESSURE CYCLING CLUTCH SWITCH . 18
REFRIGERANT SYSTEM LEAKS . . . . . . . . . . . . 18
VACUUM SYSTEM . . . . . . . . . . . . . . . . . . . . . . 11
SERVICE PROCEDURES
REFRIGERANT OIL LEVEL . . . . . . . . . . . . . . . . 19
REFRIGERANT RECOVERY . . . . . . . . . . . . . . . . 19
REFRIGERANT SYSTEM CHARGE . . . . . . . . . . . 19
REFRIGERANT SYSTEM EVACUATE . . . . . . . . . 19
REMOVAL AND INSTALLATION
ACCUMULATOR . . . . . . . . . . . . . . . . . . . . . . . . 26
BLOWER MOTOR RESISTOR . . . . . . . . . . . . . . 29
BLOWER MOTOR SWITCH . . . . . . . . . . . . . . . . 28
BLOWER MOTOR . . . . . . . . . . . . . . . . . . . . . . . 27
COMPRESSOR CLUTCH RELAY . . . . . . . . . . . . 24
COMPRESSOR CLUTCH . . . . . . . . . . . . . . . . . . 21
COMPRESSOR . . . . . . . . . . . . . . . . . . . . . . . . . 21
CONDENSER . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
DUCTS AND OUTLETS . . . . . . . . . . . . . . . . . . . 34
EVAPORATOR COIL . . . . . . . . . . . . . . . . . . . . . 33
FIXED ORIFICE TUBE . . . . . . . . . . . . . . . . . . . . 26
HEATER CORE . . . . . . . . . . . . . . . . . . . . . . . . . 33
HEATER-A/C CONTROL . . . . . . . . . . . . . . . . . . 27
HEATER-A/C HOUSING DOORS . . . . . . . . . . . . 32
HEATER-A/C HOUSING . . . . . . . . . . . . . . . . . . . 31
HIGH PRESSURE CUT-OFF SWITCH . . . . . . . . 24
HIGH SPEED BLOWER MOTOR RELAY . . . . . . 29
LOW PRESSURE CYCLING CLUTCH SWITCH . 26
MODE DOOR VACUUM ACTUATORS . . . . . . . . 30
REFRIGERANT LINE COUPLERS . . . . . . . . . . . 20
TEMPERATURE CONTROL CABLE . . . . . . . . . . 28
VACUUM CHECK VALVE . . . . . . . . . . . . . . . . . . 27
VACUUM RESERVOIR . . . . . . . . . . . . . . . . . . . 27
in a single unit housing mounted under the instru-
ment panel. On heater-only systems, the evaporator
coil and recirculating air door are omitted from the
housing .
Outside fresh air enters the vehicle through the
cowl top opening at the base of the windshield, and