Thermostat: Description and Operation

DIESEL










CAUTION: Do not operate an engine without a thermostat, except for servicing or testing. An engine with the thermostat removed will operate in the radiator bypass mode, causing an overheat condition.

The thermostat of the diesel engine is located in the front of the cylinder head, underneath a heat shield near the thermostat housing.

NOTE: The thermostat for 5.9L engine and the 6.7L are different and are not interchangeable. Use caution when replacing the thermostat to ensure the proper part number is reinstalled.

An engine should not be operated without a thermostat, except for servicing or testing. Operating without a thermostat will cause overheating.