Coolant Heater Replacement 4.8 L, 5.3 L, and 6.0 L Engines
Removal Procedure
- Drain the cooling system.
Refer to
Cooling System Draining and Filling
.
- Raise and suitably support the vehicle. Refer to
Lifting and Jacking the Vehicle
in General Information.
- Disconnect the coolant heater electrical connector (2).
Important: Do not score the surface of the engine block hole when removing the
coolant heater.
- Remove the coolant heater from the engine block.
- Remove any burrs, sealer, paint or other rough spots.
Installation Procedure
- If re-using the old coolant
heater, apply thread sealant GM P/N United States 12346004,
GM P/N Canada 10953480, or equivalent to
the threads.
Notice: Use the correct fastener in the correct location. Replacement fasteners
must be the correct part number for that application. Fasteners requiring
replacement or fasteners requiring the use of thread locking compound or sealant
are identified in the service procedure. Do not use paints, lubricants, or
corrosion inhibitors on fasteners or fastener joint surfaces unless specified.
These coatings affect fastener torque and joint clamping force and may damage
the fastener. Use the correct tightening sequence and specifications when
installing fasteners in order to avoid damage to parts and systems.
- Install the coolant heater to the engine block.
Tighten
Tighten the coolant heater to 50 N·m (37 lb ft).
Notice: 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).
- Lower the vehicle.
- Fill the cooling system. Refer to
Cooling System Draining and Filling
.
Coolant Heater Replacement 8.1L Engine
Removal Procedure
- Drain the cooling system.
Refer to
Cooling System Draining and Filling
.
- Disconnect the block heater cord from the block heater.
- Remove the engine block
heater.
Installation Procedure
- Apply sealant GM P/N 12346004,
Canadian P/N 10953480 or equivalent to the threads of the
engine block heater.
Notice: Use the correct fastener in the correct location. Replacement fasteners
must be the correct part number for that application. Fasteners requiring
replacement or fasteners requiring the use of thread locking compound or sealant
are identified in the service procedure. Do not use paints, lubricants, or
corrosion inhibitors on fasteners or fastener joint surfaces unless specified.
These coatings affect fastener torque and joint clamping force and may damage
the fastener. Use the correct tightening sequence and specifications when
installing fasteners in order to avoid damage to parts and systems.
- Install the engine block heater into the block.
Tighten
Tighten the engine block heater to 60 N·m (40 lb ft).
Notice: 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 block heater cord to the block
heater.
- Fill the cooling system. Refer to
Cooling System Draining and Filling
.
Coolant Heater Replacement 4.3 L Engine
Removal Procedure
- Drain the cooling system. Refer to
Cooling System Draining and Filling
.
- Disconnect the heater
cord from the coolant heater (4).
- Loosen the bolt retaining the coolant heater to the block.
- Remove the coolant heater from the engine block.
- Do not score the machined surface of the hole.
- Grasp the plug with pliers.
- Pull the plug from the engine block.
- Clean the core plug hole in order to remove the following substances:
Installation Procedure
- Coat the O-ring seal and
the cleaned surface of the plug opening with water resistant high-temperature
grease GM P/N United States 1052196, GM P/N Canada 5264008,
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.
Notice: Use the correct fastener in the correct location. Replacement fasteners
must be the correct part number for that application. Fasteners requiring
replacement or fasteners requiring the use of thread locking compound or sealant
are identified in the service procedure. Do not use paints, lubricants, or
corrosion inhibitors on fasteners or fastener joint surfaces unless specified.
These coatings affect fastener torque and joint clamping force and may damage
the fastener. Use the correct tightening sequence and specifications when
installing fasteners in order to avoid damage to parts and systems.
- Tighten the bolt on the
engine coolant heater until both of the locking wings draw tightly against
the inner wall of the engine block.
Tighten
Tighten the bolt in order to retain the engine coolant heater to the
engine block to 2 N·m (18 lb in).
Notice: 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
.
- Inspect the cooling system for leaks.
Coolant Heater Replacement 6.6L Engine
Removal Procedure
- Drain the cooling system
and the engine block. Refer to
Cooling System Draining and Filling
.
- Raise the vehicle. Refer to
Lifting and Jacking the Vehicle
in General Information.
- Remove the right front tire and wheel. Refer to
Tire and Wheel Removal and Installation
in Tires and Wheels.
- Remove the right front fender wheelhouse inner fender (1).
- Remove the right engine mount. Refer to
Engine Mount Replacement - Right Side
in Engine Mechanical - 6.6 L.
- Disconnect the engine
coolant heater cord.
- Loosen the bolt retaining the engine coolant heater to the block.
- Remove the engine coolant heater from the engine block.
- Do not score the machined surface of the hole.
- Grasp the plug with pliers.
- Pull the plug from the engine block.
- Clean the core plug hole in order to remove the following substances:
Installation Procedure
- Coat the O-ring seal and the cleaned surface of the plug opening
with water resistant high-temperature grease GM P/N United
States 1052196, GM P/N Canada 5264008,
or the equivalent.
Important: Avoid element contact with the inside walls of the engine block.
- Align the coolant heater element to point towards the top of the engine.
- Tightly push the coolant heater into the engine block.
Notice: Use the correct fastener in the correct location. Replacement fasteners
must be the correct part number for that application. Fasteners requiring
replacement or fasteners requiring the use of thread locking compound or sealant
are identified in the service procedure. Do not use paints, lubricants, or
corrosion inhibitors on fasteners or fastener joint surfaces unless specified.
These coatings affect fastener torque and joint clamping force and may damage
the fastener. Use the correct tightening sequence and specifications when
installing fasteners in order to avoid damage to parts and systems.
- Tighten the bolt on the
engine coolant heater until both of the locking wings draw tightly against
the inner wall of the engine block.
Tighten
Tighten the bolt in order to retain the engine coolant heater to the
engine block to 2 N·m (18 lb in).
Notice: 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.
- Install the right engine mount. Refer to
Engine Mount Replacement - Right Side
in Engine Mechanical - 6.6 L.
- Install the right front
fender wheelhouse inner fender (1).
- Install the right front tire and wheel. Refer to
Tire and Wheel Removal and Installation
in Tires and Wheels.
- Lower the vehicle.
- Fill the cooling system. Refer to
Cooling System Draining and Filling
.
- Inspect for coolant leaks.