Coolant Heater Cord Replacement 4.3 L Engine

1. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle.
2. Disconnect the coolant heater electrical connector (1).



3. Remove the coolant heater cord retainer (1).



4. Remove the coolant heater cord retainers (1).

Note: Note location of cord prior to removal.

5. Remove the coolant heater cord.

Caution: The heater cord must not touch the engine, hot pipes, manifold, or any moving parts. Route the cord to the left front of the engine compartment securing with tie straps as necessary to prevent damage.

Caution: Refer to Fastener Caution in the Preface section.




1. Install the coolant heater cord.
2. Install the coolant heater cord retainer (1).



3. Install the coolant heater cord retainers (1).



4. Connect the coolant heater electrical connector (1).
5. Lower the vehicle.

Coolant Heater Cord Replacement 4.8L, 5.3L And 6.0L Engine

1. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle.
2. Disconnect the coolant heater electrical connector (1).



3. Remove the coolant heater cord retainers (1).

Note: Note location of cord prior to removal.

4. Remove the coolant heater cord.

Caution: The heater cord must not touch the engine, hot pipes, manifold, or any moving parts. Route the cord to the left front of the engine compartment securing with tie straps as necessary to prevent damage.

Caution: Refer to Fastener Caution in the Preface section.




1. Install the coolant heater cord.
2. Install the coolant heater cord retainers (1).



3. Connect the coolant heater electrical connector (1).
4. Lower the vehicle.

Coolant Heater Cord Replacement 6.6 L Engine

1. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle.
2. Disconnect the coolant heater electrical connector (1).



3. Remove the coolant heater cord retainer (1).



4. Remove the coolant heater cord retainer (1).



5. Remove the coolant heater cord retainer (1).

Note: Note location of cord prior to removal.

6. Remove the coolant heater cord.

Caution: The heater cord must not touch the engine, hot pipes, manifold, or any moving parts. Route the cord to the left front of the engine compartment securing with tie straps as necessary to prevent damage.

Caution: Refer to Fastener Caution in the Preface section.




1. Install the coolant heater cord.
2. Install the coolant heater cord retainer (1).



3. Install the coolant heater cord retainer (1).



4. Install the coolant heater cord retainer (1).



5. Connect the coolant heater electrical connector (1).
6. Lower the vehicle.