Jeep Grand Cherokee WK. Manual — part 1775
HVAC HOUSING
1. If removed, install the insulator (3) over the A/C
evaporator (2). If the seal is deformed or damaged,
it must be replaced.
2. If removed, install the rubber seal (1) into the lower
half of the HVAC housing (4). If the seal is
deformed or damaged, it must be replaced.
3. Install the A/C evaporator into the lower half of the
HVAC housing. Make sure that the evaporator
drain within the HVAC housing is clean and unre-
stricted and that the insulator and rubber seal are
properly installed.
4. Install the upper half of the HVAC housing (3) onto
the lower half of the HVAC housing (4) and fully
engage the two plastic retaining clips (7).
5. Install the ten screws (2) that secure the two
halves of the HVAC housing together. Tighten the
screws to 2.2 N·m (20 in lbs.).
6. Install the three metal retaining clips (5) that secure
the two halves of the HVAC housing together.
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7. Remove the tape or plugs from the evaporator tube
fittings and all of the expansion valve ports.
8. Lubricate new rubber O-ring seals with clean refrig-
erant oil and install them on the evaporator tube fit-
tings. Use only the specified O-rings as they are
made of a special material for the R-134a system.
Use only refrigerant oil of the type recommended
for the A/C compressor in the vehicle.
9. Install the A/C expansion valve (2) onto the evapo-
rator tube tapping block (3) located at the front of
the HVAC housing (4).
10. Install the two bolts (1) that secure the A/C expan-
sion valve to the evaporator tube tapping block.
Tighten the bolts to 11 N·m (97 in. lbs.).
11. Install the evaporator temperature sensor (2)
(Refer to 24 - HEATING & AIR CONDITIONING/
CONTROLS - FRONT/EVAPORATOR TEMPERA-
TURE SENSOR - INSTALLATION).
12. Install the blower motor resistor or power module
(4), depending on application (Refer to 24 - HEAT-
ING & AIR CONDITIONING/CONTROLS/RESIS-
TOR-BLOWER MOTOR - INSTALLATION) or
(Refer to 24 - HEATING & AIR CONDITIONING/
CONTROLS/MODULE-POWER-BLOWER
MOTOR - INSTALLATION).
13. Install the blower motor (3) (Refer to 24 - HEAT-
ING & AIR CONDITIONING/DISTRIBUTION/MO-
TOR-BLOWER - INSTALLATION).
14. Install the HVAC wiring harness (1) onto the
HVAC housing (5) and engage the two wire har-
ness retainers to the housing.
15. Connect the HVAC wire harness to the evaporator
temperature sensor and blower motor resistor or
power module (depending on application).
16. Connect the blower motor wire harness to blower motor resistor or power module (depending on application).
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17. Install the air inlet housing (2) onto the HVAC
housing (1) (Refer to 24 - HEATING & AIR CON-
DITIONING/DISTRIBUTION/HOUSING-HVAC
-
AIR INLET HOUSING - INSTALLATION).
18. Install the air distribution housing (3) onto the
HVAC housing (Refer to 24 - HEATING & AIR
CONDITIONING/DISTRIBUTION/HOUSING-
HVAC - AIR DISTRIBUTION HOUSING - INSTAL-
LATION).
19. Install the HVAC housing assembly (Refer to 24 -
HEATING & AIR CONDITIONING/DISTRIBUTION/
HOUSING-HVAC - HVAC HOUSING ASSEMBLY -
INSTALLATION).
INSTALLATION
AIR DISTRIBUTION HOUSING
NOTE: The air distribution housing must be removed from the HVAC housing and disassembled for service
of the mode-air and blend-air doors.
1. Position the air distribution housing (2) onto the
rear of the HVAC housing (3) by inserting the tabs
on the bottom of the distribution housing into the
slots located on the bottom of the HVAC housing.
2. Tip the air distribution housing upward until it is
properly aligned with the HVAC housing and the
locking tabs at the top of the distribution housing
are fully engaged.
3. Install the seven screws (1) that secure the air dis-
tribution housing to the HVAC housing. Tighten the
screws to 2.2 N·m (20 in. lbs.).
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4. Remove the tape or plugs from the heater core
tubes (2) and the heater core (5).
5. Lubricate new rubber O-ring seals with clean
engine coolant and install them onto the heater
core tube fittings. Use only the specified O-rings as
they are made of a special material for the engine
cooling system.
6. Install the heater core tubes onto the heater core
and loosely install the bolt (4) that secures the
tubes to the heater core.
7. Install the screw (1) that secures the heater core
tubes to the HVAC housing. Tighten the screw to
2.2 N·m (20 in. lbs.).
8. Tighten the bolt that secures the heater core tubes
to the heater core to 3 N·m (27 in. lbs.).
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.).
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