Time to take it in and get it leak tested and recharged and buy a new HVAC unit button kit from from fleaby.

Climate Control Push Button Set-HVAC Push Button Set fits 00-06 BMW X5 4.4L-V8 | eBay

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2021 X5 xDrive40i
2015 X5 xDrive35i MSport
(Traded) 2013 X5 xDrive35i