Jeep Grand Cherokee WK. Manual — part 1781
3. Connect the receiver/drier inlet tube (6) to the A/C
condenser (2) (Refer to 24 - HEATING & AIR CON-
DITIONING/PLUMBING/RECEIVER
/
DRIER
-
INSTALLATION).
4. Tighten the screw (3) that secures the receiver/
drier (4) to the radiator and fan shroud (5). Tighten
the screw to to 5 N·m (44 in. lbs.).
5. Connect the A/C discharge line (1) to the A/C con-
denser (Refer to 24 - HEATING & AIR CONDI-
TIONING/PLUMBING/LINE-A/C
DISCHARGE
-
INSTALLATION) and (Refer to 24 - HEATING &
AIR CONDITIONING/PLUMBING/LINE-A/C LIQUID
- INSTALLATION).
6. Remove the tape or plugs from the automatic
transmission cooler line fittings and the fluid cooler
ports.
7. Connect the automatic transmission cooler lines (1)
to the transmission fluid cooler (2) (Refer to 7 -
COOLING/TRANSMISSION - STANDARD PROCE-
DURE - TRANSMISSION COOLER LINE QUICK
CONNECT FITTING).
8. Install the power steering fluid cooler (Refer to 19 -
STEERING/PUMP/COOLER-FLUID
-
INSTALLA-
TION).
9. Install the upper radiator crossmember and support
bracket (Refer to 23 - BODY/EXTERIOR/CROSS-
MEMBER-RADIATOR - INSTALLATION).
10. Install the air filter housing and air inlet tube
(Refer to 9 - ENGINE/AIR INTAKE SYSTEM/
HOUSING-AIR CLEANER - INSTALLATION).
11. Install the grille (Refer to 23 - BODY/EXTERIOR/
GRILLE - INSTALLATION).
12. Reconnect the negative battery cable.
13. Evacuate the refrigerant system (Refer to 24 - HEATING & AIR CONDITIONING/PLUMBING - STANDARD
PROCEDURE - REFRIGERANT SYSTEM EVACUATE).
14. Charge the refrigerant system (Refer to 24 - HEATING & AIR CONDITIONING/PLUMBING - STANDARD PRO-
CEDURE - REFRIGERANT SYSTEM CHARGE).
15. Check the automatic transmission fluid level (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC/FLUID
AND FILTER - STANDARD PROCEDURE - CHECK OIL LEVEL). Fill as required (Refer to 21 - TRANSMIS-
SION/TRANSAXLE/AUTOMATIC /FLUID AND FILTER - STANDARD PROCEDURE - TRANSMISSION FILL).
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PLUMBING
WK
CORE-HEATER
DESCRIPTION
The heater core (1) is mounted into the HVAC air dis-
tribution housing, located behind the instrument panel.
The heater core is a heat exchanger made of rows of
tubes and fins. The heater core tubes (2) are attached
to the HVAC housing by a bracket and screw (3) and
to the heater core by a flange and bolt (4).
The heater core can be serviced without removing the
air distribution housing from the vehicle.
OPERATION
Engine coolant is circulated through the heater hoses to the heater core at all times. As the coolant flows through
the heater core, heat is removed from the engine and is transferred to the heater core tubes and fins. Air directed
through the heater core picks up the heat from the heater core fins. The blend-air door(s) allows control of the
heater output air temperature by regulating the amount of air flowing through the heater core. The blower motor
speed controls the volume of air flowing through the HVAC housing.
The heater core cannot be repaired and, if faulty or damaged, it must be replaced.
REMOVAL
WARNING: Refer to the applicable warnings and cautions for this system before performing the following
operation (Refer to 24 - HEATING & AIR CONDITIONING/PLUMBING - WARNINGS) and (Refer to 24 - HEAT-
ING & AIR CONDITIONING/PLUMBING - CAUTIONS). Failure to follow the warnings and cautions could result
in possible personal injury or death.
WARNING: On vehicles equipped with airbags, disable the airbag system before attempting any steering
wheel, steering column, or instrument panel component diagnosis or service. Disconnect and isolate the
negative battery (ground) cable, then wait two minutes for the airbag system capacitor to discharge before
performing further diagnosis or service. This is the only sure way to disable the airbag system. Failure to
take the proper precautions could result in accidental airbag deployment and possible personal injury or
death.
NOTE: Take the proper precautions to protect the front face of the instrument panel from cosmetic damage
while performing this procedure.
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PLUMBING
24 - 473
1. Drain the engine cooling system (Refer to 7 -
COOLING - STANDARD PROCEDURE - COOL-
ING SYSTEM DRAIN).
2. Disconnect and isolate the negative battery cable.
3. If required, disconnect the heater hoses from the
heater core tubes in the engine compartment.
4. Remove the instrument panel (Refer to 23 - BODY/
INSTRUMENT
PANEL/INSTRUMENT
PANEL
ASSEMBLY - REMOVAL).
5. Remove the five screws (1) that secure the heater
core and tube cover (2) to the HVAC housing (3).
6. Remove the heater core and tube cover from the
HVAC housing.
7. If equipped with dual zone heating-A/C, remove the
blend door actuator (1) from the passenger side of
the HVAC air distribution housing (2) (Refer to 24 -
HEATING & AIR CONDITIONING/CONTROLS/AC-
TUATOR-BLEND DOOR - REMOVAL).
8. Remove the screw (3) that secure the heater core
tubes (4) and retaining bracket (5) to the HVAC
housing (6).
NOTE: Take proper precautions to protect the car-
peting from engine coolant. Have absorbent towel-
ing readily available to clean up any spills.
9. Remove the bolt (7) that secures the heater tubes
to the heater core (8).
10. Disconnect the heater core tubes from the heater
core and remove and discard the O-ring seals.
11. Install plugs in, or tape over the opened heater
core ports.
12. Carefully pull the heater core out of the HVAC air distribution housing.
13. If required, remove the heater core tubes from the vehicle.
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PLUMBING
WK
INSTALLATION
1. Carefully install the heater core (8) into the passen-
ger side of the HVAC air distribution housing (2).
2. Remove the tape or plugs from the heater core
ports.
3. If removed, position the heater core tubes (4) into
the vehicle.
4. Lubricate new rubber O-ring seals with clean
engine coolant and install them onto the heater
core tubes. Use only the specified O-ring as they
are made of a special material for the engine cool-
ing system.
5. Connect the heater core tubes to the heater core.
6. Install the bolt (7) that secures the heater core
tubes to the heater core. Tighten the bolt securely.
7. Install the screw (3) that secures the heater core
tube retaining bracket (5) to the HVAC housing (6).
Tighten the screw to 2.2 N·m (20 in. lbs.).
8. If equipped with dual zone heating-A/C, install the
blend door actuator (1) onto the passenger side of
the HVAC air distribution housing (Refer to 24 -
HEATING & AIR CONDITIONING/CONTROLS/AC-
TUATOR-BLEND DOOR - INSTALLATION).
9. Install the heater core and tube cover (2) onto the
HVAC housing (3).
10. Install the five screws (1) that secure the heater
core and tube cover to the HVAC housing. Tighten
the screws to 2.2 N·m (20 in. lbs.).
11. Install the instrument panel (Refer to 23 - BODY/
INSTRUMENT
PANEL/INSTRUMENT
PANEL
ASSEMBLY - INSTALLATION).
12. If disconnected, connect the heater hoses to the
heater core tubes in the engine compartment.
13. Connect the negative battery cable.
14. If the heater core is being replaced, flush the
cooling system (Refer to 7 - COOLING - STAN-
DARD
PROCEDURE
-
COOLING
SYSTEM
CLEANING/REVERSE FLUSHING).
15. Refill the engine cooling system (Refer to 7 -
COOLING - STANDARD PROCEDURE - COOL-
ING SYSTEM REFILL).
WK
PLUMBING
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