At hwy speeds 75-80MPH the temperature gauge stays at 100 C constant. The ambient temperature is 93F.
It is right?
In slow trafic stays at about 95C
If the ambient temperature drops at 75-80F then the gauge stays at 87C at hwy speeds and 95C in slow trafic.
It is normal.
I was reading all the posts regarding this issue but no clue yet.
Just to mention that all cooling component are less than a year old( radiator, water pump, thermostat, fan clutch, MB fluid) The aux fans are working fine in both stages. A/C is perfect.

Give me a clue....
Everyone on this forum is claiming that on hwy speeds the temp should be rock stady 87C . Mine is not.

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New Addition to the family
2013 Passat TDI 5Miles
2004 E500 4MATIC Wagon 95k
1996 E300 Diesel 173k Sold
1993 300E 2.8 230k Sold
1994 E320 White Wagon 373K Sold
Still dreaming about ....500E


Radu Negru