C 3500 Truck 2WD V8-6.6L DSL Turbo VIN 1 (2002)
Intake Air Heater Relay: Service and Repair
Intake Air Heater (IAH) Relay Replacement (California)
REMOVAL PROCEDURE
CAUTION: Refer to Battery Disconnect Caution in Service Precautions.
IMPORTANT: The intake air heater (IAH) relay is not pan of the glow plug relay on California Emissions vehicles.
1. Remove the negative battery cables.
2. Loosen the outlet duct clamp at the upper intake manifold cover.
3. Remove the upper intake manifold cover from the outlet duct.
4. Remove the upper intake manifold cover.
5. Disconnect the engine harness connector (2).
6. Disconnect the intake air heater (IAH) relay harness connector (3)
