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 (Federal)
REMOVAL PROCEDURE
CAUTION: Refer to Battery Disconnect Caution IN SERVICE PRECAUTIONS.
IMPORTANT: The intake air heater relay is a part of the glow plug relay on Federal 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. Remove the battery supply wiring harness nut (1) and harness connector (2).
6. Remove the glow plug wiring harness nuts and harness connectors (4,6).
7. Release the wiring harness connectors (3,5) at the glow plug relay (8).
8. Remove the glow plug wiring harness nuts and harness connectors (4,6).
9. Remove the two glow plug relay mounting nuts.
10. Remove the glow plug relay from the mounting studs.
INSTALLATION PROCEDURE
