Check radiator/hoses going to it. If they are warm when engine is showing 50C then thermostat is open and letting coolant to the radiator when it should not . If rad/hoses cold then it's something else.
Is the auxiliary Webasto heater working? 10 min to 50C does not seem that unreasonable in this cold weather if the aux heater is not working.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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