Cummins 6.7 Thermostat 2007-2025 Mishimoto MMTSRAM99L

Mishimoto thermostat for the Cummins 6.7 (2007-2025). Listed for one application: Cummins 6.7 engines, 2007-2025, in Ram, Dodge applications. Confirm your engine code and year against this listing before ordering.

What it does

The thermostat controls when coolant flows to the radiator and sets operating temperature. Stuck closed it overheats the engine; stuck open it never warms up, hurting mileage and setting a P0128. A new thermostat at the correct rating restores stable temperature.

Fits

• Ram vehicles with the Cummins 6.7 engine, 2007-2025
• Dodge vehicles with the Cummins 6.7 engine, 2007-2025

Fixes

• P0128 coolant temperature below regulating range
• overheating with a cool radiator
• a slow warm-up and poor heater output

What's included

• the thermostat (and housing / seal where the listing says so)

Specifications

• Brand: Mishimoto
• Part number: MMTSRAM99L
• Shipping weight: 0.8 lb
• Condition: new
• Product type: Thermostat

Cross-reference

Replaces or interchanges with Mishimoto MMTSRAM99L for the Cummins 6.7. Check the part number stamped on your original before ordering.

Free shipping on orders of $70 or more; everything else ships with calculated shipping at the part's real weight. Questions on fitment? Ask a tech before you buy.