Installation Procedure

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

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

NOTE: Refer to Fastener Notice in Cautions and Notices.

Install the coolant heater to the engine block.
Tighten: Tighten the coolant heater to 50 N.m (37 lb ft).

Fig 1: View Of Coolant Heater (4.8L, 5.3L & 6.0L)

Courtesy of GENERAL MOTORS CORP.

NOTE: 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.

Connect the coolant heater electrical connector (2).

Fig 2: Identifying Coolant Heater Cord & Electrical Connector

Courtesy of GENERAL MOTORS CORP.

Lower the vehicle.
Fill the cooling system. Refer to Draining and Filling Cooling System (with HP2) or Draining and Filling Cooling System (without HP2) .