Jeep Cherokee Heating and Cooling
HEATING AND AIR CONDITIONING
TABLE OF CONTENTS
| page | page | ||
|---|---|---|---|
| DESCRIPTION AND OPERATION | REFRIGERANT SYSTEM LEAKS. . . . . . . . . | . . 17 | |
| ACCUMULATOR . . . . . . . . . . . . . . . . . . . . . . . . | . . 2 | VACUUM SYSTEM . . . . . . . . . . . . . . . . . . . | . . 18 |
| BLOWER MOTOR. . . . . . . . . . . . . . . . . . . . . . . | . . 2 | SERVICE PROCEDURES | |
| BLOWER MOTOR RELAY . . . . . . . . . . . . . . . . . | . . 2 | REFRIGERANT OIL LEVEL . . . . . . . . . . . . . | . . 19 |
| BLOWER MOTOR RESISTOR. . . . . . . . . . . . . . | . . 3 | REFRIGERANT RECOVERY. . . . . . . . . . . . . | . . 22 |
| BLOWER MOTOR SWITCH. . . . . . . . . . . . . . . . | . . 3 | REFRIGERANT SYSTEM EVACUATE. . . . . . | . . 22 |
| COMPRESSOR . . . . . . . . . . . . . . . . . . | . . 3 | REFRIGERANT SYSTEM CHARGE . . . . . . . | . . 22 |
| . . . . . . . COMPRESSOR CLUTCH. . . . . . . . . . . . . . . . . . | . . 3 | REFRIGERANT SYSTEM SERVICE | |
| COMPRESSOR CLUTCH RELAY. . . . . . . . . . . . | . . 4 | EQUIPMENT. . . . . . . . . . . . . . . . . . . . . . . | . . 22 |
| CONDENSER. . . . . . . . . . . . . . . . . . . . . . . . . . . | . . 4 | REMOVAL AND INSTALLATION | |
| DUAL FUNCTION HIGH PRESSURE SWITCH | SERVICE WARNINGS AND PRECAUTIONS | . . 23 | |
| (4.0 L) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | . . 4 | ACCUMULATOR . . . . . . . . . . . . . . . . . . . . . | . . 25 |
| EVAPORATOR COIL . . . . . . . . . . . . . . . . . . . . . | . . 4 | BLEND-AIR DOOR MOTOR . . . . . . . . . . . . | . . 26 |
| FIXED ORIFICE TUBE . . . . . . . . . . . . . . . . . . . . | . 5 | BLOWER MOTOR. . . . . . . . . . . . . . . . . . . . | . . 26 |
| HEATER AND AIR CONDITIONER. . . . . . . . . . . | . . . 5 | BLOWER MOTOR RELAY . . . . . . . . . . . . . . | . . 27 |
| HEATER AND AIR CONDITIONER CONTROL . . | . . 6 | BLOWER MOTOR RESISTOR. . . . . . . . . . . | . . 27 |
| HEATER CORE . . . . . . . . . . . . . . . . . . . . . . . . . | . . 6 | COMPRESSOR . . . . . . . . . . . . . . . . . . . . . . | . . 28 |
| HIGH PRESSURE CUT-OFF SWITCH . . . . . . . . | . . 6 | COMPRESSOR CLUTCH. . . . . . . . . . . . . . . | . . 29 |
| HIGH PRESSURE RELIEF VALVE . . . . . . . . . . . | . . 7 | COMPRESSOR CLUTCH RELAY. . . . . . . . . | . . 31 |
| LOW PRESSURE CYCLING CLUTCH SWITCH. | . . 7 | CONDENSER. . . . . . . . . . . . . . . . . . . . . . . . | . . 32 |
| REFRIGERANT . . . . . . . . . . . . . . . . . . . . . . . . . | . 7 | DUAL FUNCTION HIGH PRESSURE | |
| REFRIGERANT LINES. . . . . . . . . . . . . . . . . . . . | . . . 7 | SWITCH/HIGH PRESSURE CUT-OFF | |
| REFRIGERANT LINE COUPLERS . . . . . . . . . . . | . . 8 | SWITCH. . . . . . . . . . . . . . . . . . . . . . . . . . | . . 33 |
| REFRIGERANT OIL . . . . . . . . . . . . . . . . . . . . . . | . . 8 | DUCTS AND OUTLETS . . . . . . . . . . . . . . . . | . . 33 |
| REFRIGERANT SYSTEM SERVICE PORT. . . . . | . . 9 | EVAPORATOR COIL . . . . . . . . . . . . . . . . . | . . 35 |
| VACUUM CHECK VALVE. . . . . . . . . . . . . . . . . . | . . 9 | . FIXED ORIFICE TUBE . . . . . . . . . . . . . . . . . | . . 35 |
| VACUUM RESERVOIR . . . . . . . . . . . . . . . . . . . | . . 9 | HEATER-A/C CONTROL . . . . . . . . . . . . . . . | . . 35 |
| DIAGNOSIS AND TESTING | HEATER-A/C HOUSING. . . . . . . . . . . | . . 36 | |
| A/C PERFORMANCE . . . . . . . . . . . . . . . . . . . . . | . . 9 | . . . . . HEATER-A/C HOUSING DOOR . . . . . . . . . . | . . 39 |
| BLOWER MOTOR. . . . . . . . . . . . . . . . . . . . . . . | . 12 | HEATER CORE . . . . . . . . . . . . . . . . . . . . . . | . . 41 |
| BLOWER MOTOR RELAY . . . . . . . . . . . . . | . 13 | LIQUID LINE. . . | . . 41 |
| . . . . BLOWER MOTOR RESISTOR. . . . . . . . . . . . . . | 14 | . . . . . . . . . . . . . . . . . . . . . LOW PRESSURE CYCLING CLUTCH SWITCH. | . 42 |
| BLOWER MOTOR SWITCH. . . . . . . . . . . . . . . . | . . 14 | KICK COVER. . . . . . . . . . . . . . . . . . . . . . . . | . . 42 |
| COMPRESSOR . . . . . . . . . . . . . . . . . . . . . . . . . | . 14 | MODE DOOR VACUUM ACTUATOR . . . . . . | . . 43 |
| COMPRESSOR CLUTCH COIL . . . . . . . . . . . . . | . 15 | REFRIGERANT LINE COUPLER . . . . . . . . . | . . 45 |
| COMPRESSOR CLUTCH RELAY. . . . . . . . . . . . | . 15 | SUCTION AND DISCHARGE LINE . . . . . . . | . . 45 |
| DUAL FUNCTION HIGH PRESSURE | VACUUM CHECK VALVE. . . . . . . . . . . . . . . | . . 46 | |
| SWITCH/HIGH PRESSURE CUT-OFF . . | VACUUM RESERVOIR . . . . . . . . . . . . . . . . | . . 47 | |
| SWITCH. . . . . . . . . . . . . . . . . . . . . . . . . . . | . 16 | SPECIFICATIONS | . |
| HEATER PERFORMANCE . . . . . . . . . . . . . . . . . | . 16 | A/C APPLICATION TABLE. . . . . . . . . . . . . . | . 47 |
| LOW PRESSURE CYCLING CLUTCH SWITCH. | . 17 |
Table Caption: This table is an index for a manual related to automotive climate control systems, covering topics from system description and operation to diagnosis, service procedures, removal/installation, and specifications. It lists various components of the refrigerant and heating systems, along with their corresponding page numbers for detailed information.
DESCRIPTION AND OPERATION
ACCUMULATOR
DESCRIPTION
The accumulator is mounted in the engine compartment between the evaporator coil outlet tube and the compressor inlet.
OPERATION
Refrigerant enters the accumulator canister as a low pressure vapor through the inlet tube. Any liquid, oil-laden refrigerant falls to the bottom of the canister, which acts as a separator. A desiccant bag is mounted inside the accumulator canister to absorb any moisture which may have entered and become trapped within the refrigerant system (Fig. 1).
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Fig. 1 Accumulator - Typical
- 1 -LOW PRESSURE CYCLING CLUTCH SWITCH
- 2 -PRESSURE SWITCH FITTING
- 3 -OUTLET TO COMPRESSOR
- 4 -ANTI-SIPHON HOLE
- 5 -DESICCANT BAG
- 6 -OIL RETURN ORIFICE FILTER
- 7 -VAPOR RETURN TUBE
- 8 -ACCUMULATOR DOME
- 9 -O-RING SEAL
- 10 -INLET FROM EVAPORATOR
BLOWER MOTOR
DESCRIPTION
The blower motor and blower wheel are located in the passenger side end of the heater-A/C housing, below the glove box. The blower motor controls the velocity of air flowing through the heater-A/C housing by spinning a squirrel cage-type blower wheel within the housing at the selected speed. The blower motor and wheel can be removed through an opening in the engine compartment side of the dash panel without heater-A/C housing removal.
OPERATION
The blower motor will only operate when the ignition switch is in the On position, and the heater-A/C mode control switch knob is in any
