R/V Series Auxiliary Heater - On-Vehicle Service; Blower Motor Replacement; Heater Core Replacement; Resistor Replacement - GMC G Service Manual

1A-16 HEATING
R/V SERIES AUXILIARY HEATER —

BLOWER MOTOR REPLACEMENT

H Remove or Disconnect (Figure 17)
1. Battery ground cable.
2. Blower motor wiring harness (91).
3. Clamp ( ).
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4. Screws (84) and washer (83).
5. Motor (85).
. Fan blade retaining nut and fan blade (80) from motor
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(85) (if necessary).
H Install or Connect (Figure 17)
1. Fan blade (80) and retaining nut to motor (85) (if
removed).
2. Motor (85).
3. Screws (84) and washers (83).
4. Clamp ( ).
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5. Blower motor wiring harness (91).
. Battery ground cable.
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HEATER CORE REPLACEMENT

H Remove or Disconnect (Figure 17)
1. Battery ground cable.
2. Coolant from the radiator.
3. Hoses (93 and 94) from the core (77).
4. Wiring harness (91).
5. Clamp ( ).
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. Motor (85), support (81) and fan (80) as an assembly.
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7. Screws (79).
. Upper case (75).
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9. Seal (76).
10. Core (77).
M Install or Connect (Figure 17)
1. Core (77) to lower case (78).
. Seal (76).
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3. Upper case (75).
4. Screws (79).
5. Motor (85), support (81) and fan (80).
. Clamp ( ).
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7. Wiring harness (91).
. Hoses (93 and 94) to the core (77).
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9. Coolant to the radiator.
10. Battery ground cable.
ON-VEHICLE SERVICE

RESISTOR REPLACEMENT

M Remove or Disconnect (Figure 17)
1. Battery ground cable.
2. Wiring harness connector (91).
3. Screws.
4. Resistor ( ).
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h H Install or Connect (Figure 17)
1. Resistor ( ).
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2. Screws.
3. Wiring harness connector (91).
4. Battery ground cable.
AUXILIARY BLOWER SWITCH
REPLACEMENT
M Remove or Disconnect (Figure 17)
1. Battery ground cable.
2. Wiring harness connector (107) at the switch (104).
3. Screws (102).
4. Bezel (103).
5. Switch (104).
h + l Install or Connect (Figure 17)
1. Switch (104) to the bezel (103).
2. Bezel (103) to the instrument panel.
3. Screw (102).
4. Wiring harness connector (107) to the switch (104).
5. Battery ground cable.
COOLANT-CONTROL VALVE
REPLACEMENT
The coolant-control valve is mounted to the right front
fender. To diagnose the vacuum system, refer to AIR CON­
DITIONING (SEC. 1B).
B Remove or Disconnect (Figure 17)
. Coolant from the radiator.
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2. Clamps (92).
3. Hoses (93, 94, 97 and 98) from the valve.
4. Vacuum hose (108) from the valve.
5. Valve (100).
H Install or Connect (Figure 17)
1. Valve (100).
2. Vacuum hose (108).
3. Hoses (93, 94, 97 and 98).
4. Clamps (92).
5. Coolant to the radiator.
• Leak test the valve.