Jeep Cherokee

 Service Manual

Cooling system » Description and operation
Coolant reserve/overflow system

DESCRIPTION

The system works along with the radiator pressure cap. This is done by using thermal expansion and contraction of the coolant to keep the coolant free of trapped air. It provides:

•  A volume for coolant expansion and contraction.
•  A convenient and safe method for checking/adjusting coolant level at atmospheric pressure. This is done without removing the radiator pressure cap.
•  Some reserve coolant to the radiator to cover minor leaks and evaporation or boiling losses.

The coolant reserve/overflow system consists of a radiator mounted pressurized cap, a plastic reserve/ overflow tank (Fig. 3) (Fig. 4), a tube (hose) connecting the radiator and tank, and an overflow tube on the side of the tank.

Fig. 3 Reserve/Overflow Tank-Except Right Hand Drive

1 - COOLANT RESERVE/OVERFLOW TANK
2 - CLAMP
3 - MOUNTING BOLTS
4 - TUBE TO RADIATOR

OPERATION

As the engine cools, a vacuum is formed in the cooling system of both the radiator and engine. Coolant will then be drawn from the coolant tank and returned to a proper level in the radiator.

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