Hummer H1 Service Manual page 762

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®
EVAPORATOR
Replacement
1. Remove HVAC unit from vehicle (refer to HVAC unit
replacement).
2. Remove heater core from main unit (refer to heater core
replacement).
3. Remove lower support bracket from HVAC case
(Figure 11-72).
Figure 11-72: Lower Support Bracket Removal
4. Disconnect vacuum harness from vacuum motors. Motors
are color coded to vacuum tubing (Figure 11-72).
VACUUM DOOR MOTOR HARNESS
BRN
YEL
7-S11-051
Figure 11-73: Vacuum Door Motor Harness
5. Remove air intake housing from main unit by removing
attaching screws at blower housing (Figure 11-75) and
bracket at front of unit (Figure 11-74).
Figure 11-74: Air Intake Box Front Bracket Removal
05745159
Heating/Ventilation/Air Conditioning (HVAC)
BLU
RED
GRY
BLK
ORG
WHT
7-S11-052
Figure 11-75: Lower Blower Housing Hardware
6. Remove face duct outlet plenum (Figure 11-76).
7-S11-042
7-S11-059
Figure 11-76: Face Duct Outlet Plenum
7. Remove floor door travel limiting rivet by drilling head,
note the side of the rivet the door is resting on
(Figure 11-77).
NOTE: Place a reference mark on the case to ensure that the
rivet is placed in the same location during reassembly that it
was removed from (Figure 11-77).
FLOOR OUTLET
DEFROST OUTLET
Figure 11-77: Drilling Door Travel Limiting Rivet
11-43
7-S11-043
Removal
FACE OUTLET PLENUM
REFERENCE MARK
7-S11-041
7