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on the front of the coolant tank (Fig. 4). For informa- If this lamp is illuminated, it indicates the need for service. 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 radiator. This provides quicker engine warmup The same thermostat is used for winter and sum- mer seasons. An engine should not be operated with- warmup performance, increased exhaust emissions and crankcase condensation. This conden- CAUTION: Do not operate an engine without a ther- PRESSURE/VENT CAP DESCRIPTION The pressure/vent cap is threaded-on to the coolant tank. This cap releases excess pressure at some point OPERATION The cooling system will operate at pressures up to 103 kPa (15 psi). This results in a higher coolant When the engine is cooling down, vacuum is formed within the cooling system. To prevent collapse Fig. 3 Water Pump— Typical 1 – O-RING SEAL Fig. 4 Low Coolant Level Sensor 1 – PRESSURE/VENT CAP 7 - 4 COOLING SYSTEM XJ DESCRIPTION AND OPERATION (Continued) 2000 JEEP CHEROKEE |