Chrysler Concorde 1993 Service Manual page 219

DESCRIPTION AND OPERATION
On all models an engine block heater is available as an
optional accessory. The heater, operated by ordinary
house current (110 Volt A.C.) through a power cord and
connector behind the radiator grill. This provides easier
engine starting and faster warm-up when vehicle is
operated in areas having extremely low temperatures.
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 (Fig. 10).
The power cord must be secured in its retainer
clips, and not positioned so it could contact link-
ages or exhaust manifolds and become damaged.
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 light.
REMOVAL
(1) Drain coolant from radiator and cylinder block.
Refer to Cooling System Drain, Clean, Flush and Refill
of this section for procedure.
(2) Detach power cord plug from heater.
(3) Loosen screw in center of heater. Remove heater
assembly.
INSTALLATION
(1) Thoroughly clean core hole and heater seat.
ENGINE BLOCK HEATER
(2) Insert heater assembly with element loop posi-
tioned upward.
(3) With heater seated, tighten center screw se-
curely to assure a positive seal.
(4) Fill cooling system with coolant to the proper
level, vent air, and inspect for leaks. Pressurize system
with Radiator Pressure Tool before looking for leaks.
COOLING SYSTEM
Fig. 5 Engine Block Heater
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