Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2008EXPRESS 2500 V8-6.6L DSL TURBOREPAIR AND DIAGNOSISHEATING AND AIR CONDITIONINGHEATER CONTROL VALVESERVICE AND REPAIR
2008 Chevrolet Express 2500 V8-6.6L DSL Turbo
Heater Control Valve: Service and Repair
2008 Chevrolet Express 2500 V8-6.6L DSL TurboSECTION 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.
8. Reposition the heater inlet hose clamp and the heater outlet hose clamp from the heater core using the J 38185.
9. Remove the heater inlet hose and the heater outlet hose from the heater core.
10. Remove the coolant bypass valve assembly from the vehicle.
Installation Procedure
1. Install the coolant bypass valve assembly to the vehicle.
2. Install the heater inlet hose and the heater outlet hose to the heater core.
3. Reposition the heater inlet hose clamp and the heater outlet hose clamp to the heater core using the J 38185.
4. Install the heater inlet hose and the heater outlet hose to the coolant bypass valve.
5. Reposition the heater inlet hose clamp and the heater outlet hose clamp to the coolant bypass valve using the J 38185.
6. Install the vacuum hose to the coolant bypass valve.
7. Install the accumulator.
8. Fill the cooling system. Refer to Cooling System Draining and Filling (Static Fill) Cooling System Draining and Filling (Vac N Fill).
9. Install the upper fan shroud.
10. Install the air cleaner.
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.