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Engine Block Heater

Engine, Cooling and Exhaust › Engine
Unified entry — merged from multiple cross-listed pages in the original manual.

Labor

Replace0.5 hr
Warranty 0.0 hrSkill B
Procedures
Engine Block Heater - Removal4 steps
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  1. Drain cooling system Service and Repair.
  2. Raise vehicle on hoist.
  3. Detach power cord plug (1) from block heater (2).
  4. Loosen screw in center of block heater (2). Remove heater assembly(2) from engine block's core hole (3).
Engine Block Heater - Installation6 steps
△ CAUTION
To prevent damage, the power cord must be secured in its retaining clips, and not positioned so it could contact linkages or exhaust manifold.
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  1. Thoroughly clean core hole (3) and heater seat.
  2. Insert heater assembly (2) with element loop positioned upward .
  3. With heater assembly (2) properly seated, tighten center screw securely to assure a positive seal.
  4. Connect power cord (1) to heater assembly (2).
  5. Lower vehicle.
  6. Fill cooling system Service and Repair.
Engine Block Heater: Description and Operationreference
△ CAUTION
The power cord must be secured in its retainer clips, and not positioned so it could contact linkages or exhaust manifolds and become damaged.
DESCRIPTION The block heater is operated by ordinary house current (110 Volt A.C.) through a power cord and connector located in the engine compartment. The heater is mounted in a core hole (in place of a core hole plug) in the engine block, with the heating element immersed in coolant.
Factory service manual
From the 2008 KK factory manual — descriptions, specs, torque & procedures for this part.
HEATER-ENGINE BLOCK📷 1

Description

The block heater is operated by ordinary house current (110 Volt A.C.) through a power cord and connector located in the engine compartment. The heater is mounted in a core hole (in place of a core hole plug) in the engine block, with the heating element immersed in coolant.
CAUTION: The power cord must be secured in its retainer clips, and not positioned so it could contact linkages or exhaust manifolds and become damaged.

Operation

The block heater element is submerged in the cooling system's coolant. When electrical power (110 volt A.C.) is applied to the element, it creates heat. This heat is transferred to the engine coolant. This provides easier engine starting and faster warm-up when vehicle is operated in areas having extremely low temperatures.
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REMOVAL-3.7L📷 1
1 - POWER CORD 2 - BLOCK HEATER 3 - CORE HOLE
  1.   Drain cooling system. See STANDARD PROCEDURE.
  2.   Raise vehicle on hoist.
  3.   Detach power cord plug from heater.
  4.   Loosen screw in center of heater. Remove heater assembly.
figure
INSTALLATION-3.7L📷 1
1 - POWER CORD 2 - BLOCK HEATER 3 - CORE HOLE
1. Thoroughly clean core hole and heater seat. 2. Insert heater assembly (2) with element loop positioned upward .
3. With heater seated, tighten center screw securely to assure a positive seal.
CAUTION: To prevent damage, the power cord must be secured in its retaining clips, and not positioned so it could contact linkages or exhaust manifold.
4. Connect power cord to heater. 5. Lower vehicle. 6. Fill cooling system. See STANDARD PROCEDURE.
figure