Coolant Heater Replacement

Coolant Heater Replacement (V8)

Removal Procedure





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

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

3. For 1500 series vehicles, remove the oil pan skid plate bolts and plate, if equipped.





4. For 2500 series vehicle, remove the front 2 oil pan skid plate bolts, loosen the 2 rear bolts and remove the skid plate, if equipped.





5. For vehicles with regular production option (RPO) LY6 (6.0L) perform the following steps otherwise proceed to step 10.

6. Remove the oil cooler hose bracket bolt (1).

7. Remove the oil cooler hose adapter bolts (2).

8. Remove and discard the oil cooler hose adapter gasket.

9. Reposition the oil cooler hose adapter end out of the way.





10. Disconnect the coolant heater cord electrical connector.





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

11. Remove the coolant heater from the engine block.

12. 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.





4. For vehicles with RPO LY6 (6.0L) perform the following steps otherwise proceed to step 9.

5. Position the oil cooler hose adapter end.

6. Install a NEW oil cooler hose adapter gasket.

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

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





9. If applicable, for 2500 series vehicles, position the oil pan skid plate and install the 2 front bolts and tighten the 2 rear bolts and tighten to 20 Nm (15 lb ft).





10. If applicable, for 1500 series vehicles position and install the oil pan skid plate and bolts and tighten to 20 Nm (15 lb ft).

11. Lower the vehicle.

12. Fill the cooling system/engine block. Refer to Cooling System Draining and Filling (Vac-N-Fill Gasoline) Cooling System Draining and Filling (Vac-N-Fill)Cooling System Draining and Filling (Static Fill) Cooling System Draining and Filling (Static Fill)Cooling System Draining and Filling (Static Fill LGH, LML) Cooling System Draining and Filling (Static Fill)Cooling System Draining and Filling (Vac-N-Fill Diesel) Cooling System Draining and Filling (Vac-N-Fill).