G-Van Auxiliary Heater - On-Vehicle Service; Blower Motor Replacement; Heater Core Replacement; Coolant-Control Valve Replacement - GMC G Service Manual

1A-26 HEATING
G-VAN AUXILIARY HEATER —

BLOWER MOTOR REPLACEMENT

H Remove or Disconnect (Figure 27)
1. Battery ground cable.
2. Screws (168).
3. Cover (150).
4. Wiring harness (162) from the motor (162).
5. Screws (160).
. Motor (164) and fan (157) assembly.
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7. Nut (158) from the motor (164).
. Fan (157) from the motor (164).
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9. Motor (164).
R Install or Connect (Figure 27)
1. Fan (157) to the motor (164).
2. Nut (158) to the motor (164) shaft.
3. Motor (164), fan (157) and nut (158) to the case (155).
• Apply a bead of sealer to the motor (164)
flange.
4. Screws (160).
5. Wiring harness (162) to the motor (168).
. Cover (150).
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7. Screws (168).
. Battery ground cable.
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HEATER CORE REPLACEMENT

E Remove or Disconnect (Figures 27 and 28)
1. Coolant from the radiator.
2. Battery ground cable.
3. Clamps (172) from the coolant hoses (179 and 180).
4. Coolant hoses (179 and 180) from the core (151).
5. Studs (163) from the case (155).
. Screws (168).
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7. Cover (150).
. Wiring harness (162) from the motor (164) and the
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resistor (154).
9. Case (155) and plate (159) from the vehicle.
10. Screws (160).
. Plate (159) from the case (155).
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12. Seal (152).
13. Core (151).
F I Install or Connect (Figures 27 and 28)
1. Core (151) to the case (155).
2. Seal (152) to the case (155).
3. Plate (159) to the case (155).
ON-VEHICLE SERVICE
4. Screws (160).
5. Case (155) and plate (159) to the vehicle.
. Wiring harness (162) to the motor (164) and the resis­
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tor (154).
7. Cover (150).
. Screws (168).
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9. Coolant hoses (179 and 180) to the case (155).
10. Clamps (172) to the coolant hoses (179 and 180).
11. Studs (163) to the case (155).
12. Battery ground cable.
13. Coolant to the radiator.
• Leak test the system.
COOLANT CONTROL VALVE
REPLACEMENT
The coolant-control valve is attached to the right side of
the cowl in the engine compartment.
M Remove or Disconnect (Figure 28)
1. Coolant from the radiator.
2. Coolant hoses.
3. Vacuum line.
4. Screws.
5. Valve (183).
H Install or Connect (Figure 28)
1. Valve (183).
. Screws.
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3. Vacuum line.
4. Coolant hoses.
5. Coolant to the radiator.

RESISTOR REPLACEMENT

M Remove or Disconnect (Figure 27)
1. Battery ground cable.
2. Screws (168).
3. Cover (150).
4. Wiring harness (162) to the resistor (154).
5. Resistor (154).
K H Install or Connect (Figure 27)
1. Resistor (154).
2. Wiring harness (169) to the resistor (154).
3. Cover (155).
4. Screws (168).
5. Battery ground cable.