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The thermostat is located on the front, passenger's side of the engine. Follow the upper rubber coolant hose from the top of the radiator on the driver's side. The rubber hose connects to a steel "cap" in between the alternator and the valve cover. There are three bolts to remove from the "cap". Remove the "cap" and the thermostat is located under it. Make sure to drain quite a bit of coolant from the radiator or the coolant will leak all over when you pull the "cap" off. The radiator drain is located on the underside of the radiator on the driver's side and looks like a plastic screw with a drain hole right next to it.

HERES AN INSTALL VIDEO FROM www.dieselbombers.com

http://www.YouTube.com/watch?v=oOiGRffSc2s

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Q: Where is thermostat on 1999 dodge cummins diesel?
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