Chrysler RAM TRUCK 2500 1994 Service Manual page 313

7 - 58 COOLING SYSTEM
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E N G I N E B L O C K H E A T E R S
DESCRIPTION AND OPERATION
An optional engine block heater is available with for
all models. The heater is equipped with a power cord.
The cord is attached to an engine compartment compo­
nent with tie-straps. The heater warms the engine pro­
viding easier engine starting and faster warm-up in low
temperatures. The heater is mounted in a core hole of
the engine cylinder block (in place of a freeze plug) with
the heating element immersed in engine coolant. Con­
nect the power cord to a grounded 110-120 volt AC elec­
trical outlet with a grounded, three wire extension cord.
WARNING: DO NOT OPERATE ENGINE UNLESS
BLOCK HEATER CORD HAS BEEN DISCONNECTED
FROM POWER SOURCE AND SECURED IN PLACE.
THE POWER CORD MUST BE SECURED IN ITS RE­
TAINING CLIPS AND ROUTED AWAY FROM EX­
HAUST MANIFOLDS AND MOVING PARTS.
The 3.9L/5.2L/5.9L gas powered engine has the
block heater located on the right side of engine next
to the oil filter (Fig. 1).
The 8.0L V-10 engine has the block heater located
on the right side of engine next to the engine oil dip­
stick tube (Fig. 2).
Fig. 1 Engine Block Heater—3.9U5.2U5.9L Gas
Powered Engine
REMOVAL
(1) Disconnect negative battery cable from battery.
(2) Drain coolant from radiator and cylinder block.
(3) Remove power cord from heater (Figs. 1 or 2).
HEATER J9407-,
Fig. 2 Engine Block Heater—8.0L V-10 Engine
Fig. 3 Engine Block Heater—Diesel Engine
(4) Loosen (but do not completely remove) the
screw at center of block heater (Fig. 1 or 2).
(5) Remove block heater from engine. After remov­
ing block heater, note direction of heating element
coil (up or down). Element coil must be installed cor­
rectly to prevent damage.
INSTALLATION
(1) Thoroughly clean the cylinder block freeze plug
hole and block heater seat.
(2) Insert block heater into cylinder block.
(3) With heater fully seated, tighten center screw.
(4) Fill cooling system with recommended coolant. Re­
fer to Refilling Cooling System section in this group.
(5) Start and warm the engine.
(6) Check block heater for leaks.