I have measured my lupo 3l with 1.2 tdi engine fully blocked grill:
When outside temperature is +5 celsius it works up to 105 km/h. after that speed fan kicks in and you can drive up 125 km/h and after that speeds the water temperature starts to be over 100 celsius and rises.
If outside temperature goes to -10 celsius or colder you can drive +15 km/h faster without the fan kicking in and +25 km/h faster to reach over 100 celsius.
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