TrailBlazer 2WD L6-4.2L VIN S (2003)
Engine Block Heater: Service and Repair
Coolant Heater
Coolant Heater Replacement (4.2L Engine)
Removal Procedure
1. Drain the engine coolant.
2. Remove the PCM.
3. Remove the harnesses from the engine harness bracket.
4. Remove the bolt that secures the engine harness bracket and remove the bracket.
5. Remove the coolant heater cord from the heater (2).
6. Remove the coolant heater from the block.
