From service manual, the entire chapter
The engine block heater(1) is mounted in the cylinder
block (2), near the right rear corner. The block heater
is a dry cylinder type design and is powered by 110
volt AC. The power cord must be secured in its
retainer clips, and not positioned so it could contact
linkages or exhaust manifolds and become
When power is applied (110 volt AC) to the block heater, the heating element transfers heat through the aluminum
engine block and into the coolant without directly penetrating the cooling system.
DIAGNOSIS AND TESTING
ENGINE BLOCK HEATER
If unit does not operate, trouble can be in either the power cord or the heater element. Test power cord for continuity
with a 110-volt voltmeter or 110-volt test light; test heater element continuity with an ohmmeter or 12-volt test
LX ENGINE 7 - 37
1. Raise vehicle on hoist.
2. Detach power cord plug from block heater (1).
3. Remove block heater attaching screw located
below heater terminals.
4. Remove block heater from cylinder block (2).
1. Thoroughly clean cylinder block heater cavity.
2. Insert heater assembly (1) into block (2) with
mounting hole is located below heater terminals.
3. Install mounting screw and tighten to 12 N·m (105
4. Attach power cord to heater.
CAUTION: To prevent damage, the power cord
must be secured in its retainer clips, and not positioned
so it could contact linkages or exhaust
5. Lower vehicle.