ok so long story short , i have this x5 since 2012, and every winter i always have a coolant leak (heater always around 32 or at least above 27) ,
after year and year of investivigation, i finally foound out that i only lose coolant when i put my heater at 32degress, but have no issue at 17 degrees.... what the fuck ?

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BMW X5 3.0i 2006