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How to change a cummins 12 valve thermostat 
Disconnect the negative (black) cable from the engine's battery. 
Drain the engine's coolant into a container. 
Close the container as soon as liquid stops draining from the truck.
Lift the belt tensioner with a 3/8-inch (9.53 mm) breaker bar and remove the drive belt. Disconnect the engine's upper radiator hose from the thermostat's cover.