The Audi S4 was designed to replace the outgoing C3. Audi has plenty of quality cars and parts, such as the heater control valve. It is operated by a Bowden cable that controls flaps in the valve.
Although Audi S4 has lots of parts with impressive performance, the heater control valve still needs repair and maintenance after a long time of usage. The heater control valve is used to allow coolant to pass into the heater core when the heater switch has been turned on. The heater control valve is typically located on the heater inlet hose and is driven by a cable, vacuum motor, or an electric solenoid (depending on the car). There are lots of nice Audi S4 parts available online. Get impressive services and upkeep here with performance Audi S4 products.