Installation Procedure

WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: View Of Coolant Heater Installation Position

Courtesy of GENERAL MOTORS CORP.

Coat the O-ring seal and the cleaned surface of the plug opening with water resistant high-temperature grease lubricant GM P/N 9985164 (Canadian P/N 10953480), or the equivalent.

IMPORTANT: Avoid element contact with the inside walls of the engine block.

Tightly push the coolant heater (1) into the engine block.

NOTE: Refer to Fastener Notice .

Fig 2: View Of Coolant Heater Locking Wings & Engine Block Inner Wall

Courtesy of GENERAL MOTORS CORP.

Tighten the coolant heater bolt until both of the locking wings draw tightly against the inner wall of the engine block.
Tighten: Tighten the bolt to 2 N.m (18 lb in).

Fig 3: View Of Coolant Heater (4.3L)

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 heater cord to the coolant heater (4).
Fill the cooling system. Refer to Cooling System Draining and Filling (Static Fill) or Cooling System Draining and Filling (Vac-N-Fill) .
Inspect the cooling system for leaks.