Hummer H1 Service Manual page 769

11-50 Heating/Ventilation/Air Conditioning (HVAC)
EVAPORATOR/HEATER
MESH FILTER
PLASTIC PIN
BOTTOM HOUSING
PLENUM
AUXILIARY EXPANSION VALVE
REPLACEMENT
Removal
1. Discharge air conditioning system.
2. Remove rear console.
3. Remove prestite tape and bulb clamp.
4. Using two wrenches for equalized support, remove high-
pressure hose from expansion valve. Remove O-ring from
hose and discard O-ring (Figure 11-93).
5. Using two wrenches for equalized support, remove
expansion valve from auxiliary unit. Remove and discard
O-ring (Figure 11-86).
Installation
1. Install O-ring and expansion valve on auxiliary unit. Using
two wrenches for equalized support, tighten to 15-20 lb-ft
(20-27 N•m) (Figure 11-86).
2. Position O-ring onto high pressure hose and hand-thread
hose fitting onto the expansion valve. Using two wrenches
for equalized support, tighten to 11-13 lb-ft (15-17 N•m)
(Figure 11-93).
3. Install prestite tape and bulb clamp.
4. Evacuate, charge, and leak test system.
5. Install rear console.
6. Start engine and check operation of auxiliary unit.
TOP HOUSING
CORE ASSEMBLY
Figure 11-92: Auxiliary Air Conditioning Components
BLOWER MOTOR ASSEMBLY
CLIP
AUXILIARY
UNIT
BULB
CLAMP
MOUNTING
BRACKET
BULB
Figure 11-93: Expansion Valve
______________________
PLASTIC LOCKING PIN
EXPANSION VALVE
TUNNEL SUPPORT BRACKET
EXPANSION
LOW PRESSURE A/C HOSE
VALVE
Removal/Installation
®
HIGH PRESSURE
HOSE