As far as I can tell only reason for running cold is faulty thermostat. If the thermostat is working correctly coolant does not go through radiator and fans can work at full blast it will still warm up properly.
Another possibility is that it is just reporting temperature incorrectly. Not sure about 3.0 TDI but many cars have several(2) temp sensors.
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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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