Express 3500 V8-6.6L DSL Turbo (2008)
Heater Control Valve: Service and Repair
Coolant Bypass Valve Replacement (6.6L)
Special Tools
J 38185 Hose Clamp Pliers
Removal Procedure
1. Remove the air cleaner assembly.
2. Remove the upper fan shroud.
3. Remove the accumulator.
4. Remove the vacuum hose from the coolant bypass valve.
5. Drain the engine coolant. Refer to Cooling System Draining and Filling (Static Fill) Cooling System Draining and Filling (Vac N Fill).
6. Reposition the heater inlet hose clamp and the heater outlet hose clamp from the coolant bypass valve using the J 38185.
7. Remove the heater inlet hose and the heater outlet hose from the coolant bypass valve.