Description:

[Part Number] 4H0-121-671-D, 4H0-121-671-B, 1J0-973-702. [Fitment] for Audi A3 2015-2020; for Audi A4 2018-2019; for Audi A6 2012-2018; for Audi Q3 2015-2018; for Audi Q5 2013-2019; for Audi Q7 2013-2020; for Audi Q8 2019-2020; for Audi S3 2015-2020; for Audi S6 2013-2018; for Audi S7 2013-2018; for Audi S8 2013-2020.. [Pros] Original size, fully adapted. Improved electronics are more sensitive and help you control the speed of coolant flow through the heater core more precisely.. [Function] The heater control valve (sometimes called the hot water valve) is used to control the rate at which coolant flows through the heater core..