K 3500 Truck 4WD V8-6.5L DSL Turbo VIN S (1999)
Heater Control Valve: Service and Repair
Heating and Ventilation
REMOVAL PROCEDURE
1. Drain the engine coolant. Refer to Draining and Filling Cooling System in Engine Cooling.
2. Remove the hose clamps from the outlet pipe (6) and from the inlet pipe (5).
3. Remove the heater inlet pipe (5) and the outlet pipe (6) from the bypass valves (4).
4. Remove the bolts (3) that retain the valves to the heater assembly.
5. Remove the bypass valves (4) from the heater assembly.
INSTALLATION PROCEDURE
1. Install the bypass valves (4) to the heater assembly.
NOTE: Refer to Fastener Notice in Cautions and Notices.
2. Install the bolts that retain the valves (4) to the heater assembly.
Tighten
Tighten the bolts to 4 N.m (35 lb in).
3. Install the heater inlet pipe (5) and the outlet pipe (6) to the bypass valves.
4. Install the hose clamps.
5. Fill the cooling system. Refer to Draining and Filling Cooling System in Engine Cooling.
6. Ensure that no leaks exist in the cooling system.
