Blower Switch Replacement; Selector Replacement; Resistor Replacement; Blower Motor Relay Replacement - GMC G Service Manual

3. Place the temperature lever in full HOT position and
hold while tightening the cable attaching screw.
4. Quickly move the temperature lever from full HOT to
full COLD and back. The adjusting tab (494) should
self-adjust, and the door should be heard seating at
the stops.
5. Install instrument panel compartment and door.

BLOWER SWITCH REPLACEMENT

I++I
Remove or Disconnect (Figures 61, 62, 63
and 65)
1. Battery ground cable.
2. Control assembly (491). Refer to "Control Assembly
Replacement" in this section.
3. Switch mounting screws.
4. Switch (503).
H Install or Connect (Figures 61, 62, 63 and 65)
1. New switch.
2. Mounting screws.
3. Control assembly (491). Refer to "Control Assembly
Replacement" in this section.
4. Battery ground cable.

SELECTOR REPLACEMENT

H Remove or Disconnect (Figure 66)
1. Control assembly. Refer to "Control Assembly
Replacement" in ths section.
2. Vacuum line at vacuum selector valve (511).
3. Vacuum selector valve (511).
4. Selector switch screws (520).
5. Selector switch (507).
H Install or Connect (Figure 66)
1. New selector switch (507).
• Align front tab to hole on slide (513).
2. Selector switch screws (520).
3. Vacuum selector valve (if removed) (511).
4. Vacuum line to vacuum selector valve (511).
5. Control assembly. Refer to "Control Assembly
Replacement" in this section.
AIR CONDITIONING IB -59

RESISTOR REPLACEMENT

R Remove or Disconnect (Figure 67)
1. Electrical harness connector.
2. Resistor mounting screws.
3. Resistor (3).
h H Install or Connect (Figure 67)
1. Resistor (3).
2. Resistor mounting screws.
3. Electrical harness connector.
BLOWER MOTOR RELAY
REPLACEMENT
M Remove or Disconnect (Figure 67)
1. Electrical harness connector.
2. Relay mounting screw.
3. Relay (16).
H Install or Connect (Figure 67)
1. Relay (16).
2. Relay mounting screw.
3. Electrical harness connector.

A/C RIGHT DUCT REPLACEMENT

H Remove or Disconnect (Figure 68)
1. Battery ground cable.
2. Engine cover.
3. Instrument panel bezel. Refer to INSTRUMENT
PANEL AND GAGES (SEC. 8C).
4. Bolt at parking brake bracket.
5. Screws at the top and bottom of the instrument panel.
6. Steering column bolts and lower column. Refer to
STEERING COLUMN (SEC. 3B4).
7. Radio support bracket mounting nut.
• Pull right side of the instrument panel rearward.
8. Screws at the defroster ducts (495).
9. Right pillar post molding and right sunvisor.
10. Steering column lower panel.
• Pull right side of instrument panel rearward to gain
access to right duct screws.
11. A/C right duct mounting screws (on right side).
12. A/C right duct (527).
H Install or Connect (Figure 68)
1. A/C right duct (527).
2. A/C right duct mounting screws (on the right side).
3. Steering column lower panel.
4. Right pillar post molding and right sunvisor.
5. Screws at defroster duct (495).
6. Radio support bracket mounting nut.
• Pull the right side of the instrument panel
rearward.