All the hoses are ok and the radiator is new not insects or debris that can block it.
The presure cap on the coolant reservoir is also new.
Coud be a small leak in the coolant reservoir that release the presure?
It look old to me.
I am trying to replace it .

I am completly puzzled.
Thank for your help, and maybe you guys have more Ideas.
I was reading some postings that the termostat can be installed wrong or the fan wings are installed backwords. Do you belive in that ?

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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