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It doesn't technically need one, but I would recommend it. Running the truck without a thermostat would let motor run at a good temperature, but it also wouldn't allow the radiator to cool it as good. Without thermostat the motor and radiator will stay around same temp. so if motor ever did run hot so would radiator. With a thermostat at allows the coolant to be cooled in the radiator before it opens up to go through the motor.

YesWith out a thermostat the engine will not get warm enough to evaporate any moisture in the oil an severe sludging will result.
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15y ago

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