LS Gen III 4.8/5.3/5.7/6.0 Thermostat 1999-2006 Michigan Motorsports MM-00172

Michigan Motorsports thermostat for the LS Gen III 4.8/5.3/5.7/6.0 (1999-2006). Listed for one application: LS Gen III 4.8/5.3/5.7/6.0 engines, 1999-2006, in Chevrolet, GMC, Pontiac, Cadillac 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 LS Gen III 4.8/5.3/5.7/6.0 engine, 1999-2006
• GMC vehicles with the LS Gen III 4.8/5.3/5.7/6.0 engine, 1999-2006
• Pontiac vehicles with the LS Gen III 4.8/5.3/5.7/6.0 engine, 1999-2006
• Cadillac vehicles with the LS Gen III 4.8/5.3/5.7/6.0 engine, 1999-2006

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: Michigan Motorsports
• Part number: MM-00172
• Shipping weight: 0.8 lb
• Condition: new
• Product type: Thermostat

Cross-reference

Replaces or interchanges with Michigan Motorsports MM-00172 for the LS Gen III 4.8/5.3/5.7/6.0. 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.