A thermostat is a component which senses the temperature of a physical system and performs actions so that the system's temperature is maintained near a desired setpoint. Most thermostats are about 5cm in diameter, and sit between your car’s engine and radiator. Each one works by limiting the flow of liquid coolant until your engine reaches the right temperature. Maxpeedingrods Provides Thermostat Assembly fit for Audi A6, A8, for VW Jetta, MK3 and etc. Get your quality Thermostat Assembly replacement parts for wide variety of models from Maxpeedingrods.