Coolant Heater Replacement

Coolant Heater Replacement (V8)

Removal Procedure

1. Drain the cooling system/engine block. Refer to Cooling System Draining and Filling (Static Fill) Cooling System Draining and Filling (Static Fill)Cooling System Draining and Filling (Vac N Fill) Cooling System Draining and Filling (Vac N Fill)Cooling System Draining and Filling (Static Fill Diesel) Cooling System Draining and Filling (Static Fill).

2. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle Service and Repair.





3. For vehicles with regular production option (RPO) L76 (6.0L), perform the following steps. Otherwise, proceed to step 8.

4. Remove the oil cooler hose bracket bolt (1), if equipped.

5. Remove the oil cooler hose adapter bolts (2), if equipped.

6. Remove and discard the oil cooler hose adapter gasket, if equipped.

7. Position the oil cooler hose adapter end out of the way, if equipped.





8. Disconnect the coolant heater cord electrical connector (1).





Note:
Do not score the surface of the engine block hole when removing the coolant heater.

9. Remove the coolant heater from the engine block.

10. Remove any burrs, sealer, or other rough spots.

Installation Procedure





1. If reusing the old coolant heater, apply thread sealant GM P/N 12346004 (Canadian P/N 10953480), or equivalent to the threads.

Caution:
Refer to Fastener Caution Fastener Caution.

2. Install the coolant heater to the engine block and tighten to 50 Nm (37 lb ft).





3. Connect the coolant heater cord electrical connector (1).





4. For vehicles with RPO L76 (6.0L) perform the following steps otherwise proceed to step 10.

5. Position the oil cooler hose adapter end, if equipped.

6. Install a NEW oil cooler hose adapter gasket, if equipped.

7. Install the oil cooler hose adapter bolts (2), if equipped and tighten to 12 Nm (106 lb in).

8. Install the oil cooler hose bracket bolt (1), if equipped and tighten to 25 Nm (18 lb ft).

9. Lower the vehicle.

10. Fill the cooling system/engine block. Refer to Cooling System Draining and Filling (Static Fill) Cooling System Draining and Filling (Static Fill)Cooling System Draining and Filling (Vac N Fill) Cooling System Draining and Filling (Vac N Fill)Cooling System Draining and Filling (Static Fill Diesel) Cooling System Draining and Filling (Static Fill).




Coolant Heater Replacement (V8 without 6.0L)

Removal Procedure





1. Drain the cooling system. Refer to Cooling System Draining and Filling (Static Fill) Cooling System Draining and Filling (Static Fill)Cooling System Draining and Filling (Vac N Fill) Cooling System Draining and Filling (Vac N Fill)Cooling System Draining and Filling (Static Fill Diesel) Cooling System Draining and Filling (Static Fill).

2. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle Service and Repair.

3. Disconnect the coolant heater electrical connector (2).





Note:
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.

Caution:
Refer to Fastener Caution Fastener Caution.

2. Install the coolant heater to the engine block and tighten to 50 Nm (37 lb ft).





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.

3. Connect the coolant heater electrical connector (2).

4. Lower the vehicle.

5. Fill the cooling system. Refer to Cooling System Draining and Filling (Static Fill) Cooling System Draining and Filling (Static Fill)Cooling System Draining and Filling (Vac N Fill) Cooling System Draining and Filling (Vac N Fill)Cooling System Draining and Filling (Static Fill Diesel) Cooling System Draining and Filling (Static Fill).