Hummer H1 Service Manual page 763

11-44 Heating/Ventilation/Air Conditioning (HVAC)
8. Remove arm retaining push clip, arm and 2 washers from
the floor door and defrost door (Figure 11-78).
PUSH CLIP
7-S11-040
FLOOR DOOR MOTOR
Figure 11-78: Push Clip Removal
9. Remove defrost motor from the bracket, note position of
mounting studs in mounting plate (Figure 11-79).
DEFROST DOOR MOTOR
Figure 11-79: Vacuum Door Motor Mounting Plate
10. Remove arm retaining push nuts and washers from
remaining vacuum motors.
11. Remove screws securing vacuum motor mounting plate to
main HVAC unit, and remove mounting plate. If the floor
door travel limiting rivet was not removed, the door arm
will prevent removal of the mounting plate by not aligning
with the elongated slot (Figure 11-79).
12. Remove screws securing case halves together. Do not
attempt to separate case at this time (Figure 11-80).
13. Remove screws securing thermostatic cycling switch to
HVAC unit case (Figure 11-80).
CAUTION: Do not attempt to pull the switch out of the case,
the capillary tube is secured to the evaporator.
14. Using a utility knife, carefully cut through the sealer
between the two case halves. Use caution to prevent
cutting the case.
DEFROST DOOR MOTOR
7-S11-046
VACUUM DOOR
MOUNTING PLATE
______________________
SCREW
THERMOSTATIC CYCLING SWITCH
Figure 11-80: Case Half Hardware Removal
15. Using a putty knife or scraper, carefully spread apart the
entire case seam.
16. Separate case halves. Note that the thermostatic cycling
switch must stay with the case half containing the evaporator.
17. Remove permagum tape from around liquid and vapor
tubes, discard.
18. Remove expansion valve from the passthrough plate,
discard gasket (Figure 11-81).
Figure 11-81: Expansion Valve Removal
S-CLIP
7-S11-048
EXPANSION VALVE
7-S11-044
®