Duramax LMM Thermostat 2007-2010 ARP 430-740

ARP thermostat for the Duramax LMM (2007-2010). Listed for one application: Duramax LMM engines, 2007-2010, in Chevrolet, GMC 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

• Chevrolet vehicles with the Duramax LMM engine, 2007-2010
• GMC vehicles with the Duramax LMM engine, 2007-2010

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: ARP
• Part number: 430-740
• Shipping weight: 0.8 lb
• Condition: new
• Product type: Thermostat

Cross-reference

Replaces or interchanges with ARP 430-740 for the Duramax LMM. 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.