180 Degree Thermostat with Seal for '00-04 Focus Zetec/SVT/ST170

Replacing the factory thermostat with our low-temp replacement will allow the engine to run cooler, making more power and reducing the engine's tendency to detonate. Detonation, usually producing audible pinging or even knocking sounds, refers to the spontaneous explosion of the unburned air/fuel mixture in the combustion chamber. Detonation violently ends the normal combustion process, reduces power, and can severely damage the engine.