Express 3500 V8-4.8L (2007)
Engine Block Heater: Service and Repair
Coolant Heater Replacement (4.8L, 5.3L (except RPO L33), 6.0L)
Coolant Heater Replacement (4.8L, 5.3L (except RPO L33), 6.0L)
Removal Procedure
1. Drain the cooling system.
2. Raise and suitably support the vehicle. Refer to Vehicle Lifting.
3. Disconnect the coolant heater electrical connector (2).
Important: Do not score the surface of the engine block hole when removing the coolant heater.
4. Remove the coolant heater from the engine block.
5. Remove any burrs, sealer, paint or other rough spots.
Installation Procedure
1. If re-using the old coolant heater, apply thread sealant GM P/N 12346004 (Canadian P/N 10953480), or equivalent to the threads.
Notice: Refer to Fastener Notice.
2. Install the coolant heater to the engine block.
Tighten the coolant heater to 50 N.m (37 lb ft).
