Hummer H1 Service Manual page 768

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AUXILIARY LOW-PRESSURE HOSE
REPLACEMENT
Removal
1. Discharge air conditioning system.
2. Remove air cleaner assembly and air induction tube
(Section 3).
3. Using two wrenches for equalized support, remove
auxiliary low-pressure hose from low-pressure hose
fitting. Remove and discard O-ring (Figure 11-90).
4. Remove two P-clamps securing hoses to underbody.
5. Remove front and rear consoles.
6. Remove prestite tape from low-pressure hose. Using two
wrenches for equalized support, remove hose from
auxiliary unit. Remove and discard O-ring (Figure 11-91).
7. From under the vehicle, pull low-pressure hose through
grommet.
CAUTION: To avoid potential thread or fitting damage, hand
start connections before using wrenches.
Installation
1. Route evaporator end of hose through grommet to auxil-
iary unit.
2. Lubricate and position O-ring on hose and secure to
auxiliary unit. Using two wrenches for equalized support,
tighten to 21-27 lb-ft (29-37 N•m) (Figure 11-91).
3. Route other end of low-pressure hose to under hood low
pressure fittings.
4. Lubricate and position O-ring and secure auxiliary low
pressure hose to existing low pressure hose fitting. Using
two wrenches for equalized support, tighten to 24-28 lb-ft
(33-38 N•m) (Figure 11-90).
5. Install two P-clamps to secure hoses to underbody.
6. Install front and rear consoles.
7. Evacuate, charge, and leak test system.
8. Start engine and check A/C operation.
05745159
Heating/Ventilation/Air Conditioning (HVAC)
AUXILIARY EVAPORATOR/HEATER CORE
REPLACEMENT
Removal
1.
2.
3.
4.
5.
6.
7.
8.
9.
NOTE: If expansion valve is to be reused, remove from evap-
orator/heater core assembly and install on replacement unit.
Installation
1.
2.
3.
4.
5.
6.
7.
AUXILIARY BLOWER MOTOR REPLACEMENT
Removal
1.
2.
3.
Installation
1.
Remove auxiliary unit from vehicle.
Remove four screws and plenum from housing.
With auxiliary unit on bench, remove six plastic locking
pins securing unit housing halves together (Figure 11-92).
Remove four screws from blower motor support.
Remove four screws securing side brackets to upper
housing half.
Separate housing halves.
Remove blower motor assembly from bottom housing.
Remove evaporator/heater core assembly from bottom
housing.
Remove plastic stick pins and mesh filter from evaporator/
heater core assembly.
Install mesh filter on evaporator/heater core assembly with
plastic stick pins (Figure 11-92).
Install evaporator/heater core assembly in bottom housing.
Install blower motor assembly in bottom housing.
Install upper housing to lower housing with six plastic
locking pins, four blower motor support screws, and four
screws securing side brackets to upper housing.
Install plenum on housing with four screws.
Install auxiliary unit into vehicle.
Evacuate, charge, and leak test A/C and heating system.
Disconnect auxiliary unit mounting hardware and tilt unit
up to gain access to blower motor support screws.
Remove support screws and screws securing side brackets
to upper housing half.
Separate housing halves and remove blower motor
assembly from bottom housing.
Installation is the reverse of the removal procedure.
11-49