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CONDITION POSSIBLE CAUSES CORRECTION COOLANT LEVEL CHANGES IN COOLANT TANK. TEMPERATURE GAUGE IS IN NORMAL RANGE 1. Level changes are to be expected 1. This a normal condition. No COOLING SYSTEM FLOW CHECK - DIESEL ENGINE To determine whether coolant is flowing through the cooling system, use the following procedures: 1. If engine is cold, idle engine until normal operating temperature is reached. Then feel the upper radiator hose. If it is hot, coolant is circulating. WARNING: DO NOT REMOVE THE COOLING SYSTEM PRESSURE CAP WITH THE SYSTEM HOT AND 2. Remove pressure/vent cap when engine is cold, idle engine until thermostat opens, you should observe coolant flow while looking down in the coolant recovery pressure container. Once flow is detected install the pressure/ COOLING SYSTEM AERATION Low coolant level in a cross flow radiator will equalize in both tanks with engine off. With engine running and at • High reading shown on the temperature gauge. • Loss of coolant flow through the heater core. • Corrosion in the cooling system. • Water pump seal may run dry, increasing the risk of premature seal failure. • Combustion gas leaks into the coolant can also cause aeration. 7 - 18 COOLING KJ |