This genuine Cummins 4BT and 6BT Gen 1 Dodge 180 Degree 54mm thermostat (part 3972071) is the perfect thermostat for using with either:
- Our HD high mount kit, or
- Any B-series Cummins engine application with a water outlet that requires a 54mm thermostat
This thermostat is vented and rated to open at 180 Degrees Fahrenheit. We include with your purchase the required thick o-ring seal (part 3923331).
Important installation note:
For installation, the vent pins must (1) move freely and (2) be oriented in the up position (i.e., facing 12 o’clock). This positioning allows air to bypass around the thermostat and out of the cooling system. If the thermostat is not positioned correctly, air will become trapped; in turn, the thermostat will not open correctly and potentially cause your engine to overheat.