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Cooling System Malfunctions - Diagnosis
Page 7-8
Cooling System
DODGETurbo Diesel
Thermostat
The thermostat controls the coolant temperature. When the
coolant temperature is below the operating range, coolant is
bypassed back to the inlet of the water pump. When the
coolant temperature reaches the operating range, the
thermostat opens, sealing off the bypass, forcing coolant to
flow to the radiator.
Caution: Never operate the engine without a thermostat.
Without a thermostat the path of least resistance for the
coolant is through the bypass to the pump Inlet. This will
cause the engine to overheat.
An incorrect or malfunctioning thermostat can cause the
engine to run too hot or too cold.
As previously discussed, jiggle pins are Fitted to openings in the
thermostat flange, to vent air from the cooling system during
fill, and to act as check valves to block the flow of coolant
through the openings during engine operation.
Note: A missing jiggle pin can cause the engine to run cold.
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Troubleshooting
