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THERMOSTAT DESCRIPTION A pellet-type thermostat controls the operating temperature of the engine by controlling the amount OPERATION The thermostat starts to open at 80°C (176°F). Above this temperature, coolant is allowed to flow to The same thermostat is used for winter and sum- mer seasons. An engine should not be operated with- lems. These are: longer engine warmup time, unreli- warmup performance, increased exhaust emissions and crankcase condensation. This conden- CAUTION: Do not operate an engine without a ther- RADIATOR PRESSURE CAP DESCRIPTION All radiators are equipped with a pressure cap. This cap releases pressure at some point within a The cooling system will operate at pressures slightly above atmospheric pressure. This results in a A vent valve in the center of the cap allows a small coolant flow through the cap when coolant is below Fig. 3 Water Pump— Typical 1 – O-RING SEAL Fig. 4 Low Coolant Level Sensor 1 – LOW COOLANT LEVEL SENSOR 7 - 4 COOLING SYSTEM WJ DESCRIPTION AND OPERATION (Continued) 2000 JEEP GRAND CHEROKEE |