TrailBlazer 2WD L6-4.2L VIN S (2003)
Engine Block Heater: Service and Repair
Heater Cord
Coolant Heater Cord Replacement
Removal Procedure
1. If equipped with a 4.2L engine, remove the PCM.
2. Remove the coolant heater cord from the engine harness bracket (1).
3. Remove the coolant heater cord from the coolant heater (2).
4. If equipped with a 5.3L engine, disconnect the coolant heater cord from the coolant heater (1).
5. Remove the coolant heater cord clip from the engine harness.
6. Disconnect the coolant heater cord retainers (1) from the battery cover.
Installation Procedure
