For BMW 640I 2013-2018. For BMW 550I 2011-2016. For BMW 550I GT 2010-2015. For BMW 535I 2011-2016. For BMW 535I GT 2011-2017. For BMW 528I 2011-2016. The water valve is closed when the weather is hot; The water valve opens to heat the interior of the car When the weather is cold.
