Jeep Cherokee

 Service Manual

Cooling system » Description and operation
Block heater

DESCRIPTION

WARNING: DO NOT OPERATE ENGINE UNLESS BLOCK HEATER CORD HAS BEEN DISCONNECTED FROM POWER SOURCE AND SECURED IN PLACE.

An optional engine block heater is available for all models. The heater is equipped with a power cord.

The cord is attached to an engine compartment component with tie-straps. The heater warms the engine providing 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.

BLOCK HEATER SPECIFICATIONS

•  2.5L 4-Cylinder Engine: 115 Volts 400 Watts
•  4.0L 6-Cylinder Engine: 120 Volts 600 Watts

Fig. 6 Engine Block Heater

1 - BLOCK HEATER
2 - CYLINDER BLOCK
3 - BLOCK HEATER POWER CORD

OPERATION

Connecting the power cord to a grounded 110-120 volt AC electrical outlet with a grounded, three-wire extension cord activates the block heater.

Cooling system

Automatic transmission oil cooler

Coolant reserve/overflow system

Cooling system fans

Block heater

Thermostat

Radiator

Radiator pressure cap

Water pump

Hose clamps

Viscous fan drive

Electric cooling fan