VS....in the other thread that began relating to the Citric Acid cleaning of the cooling system.....you mention that your car is running at 100*C.....if so your aux fan should be on.....

The reason that I mentioned this in the first place, is.....if you read the AC Klima Shop Manual.....in there you will see the AC block identified as being on the outlet of the head....but in that photo there are 2 sensors there with the other unmentioned....so I had assumed that the solo one that I had there was for the AC System....when I began my little M&R session, I learned otherwise, and was just posting to let others know.....

SB

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Diesels:
'85 300D, "Max, Blue Benz", 155K, 27.0 MPG
'84 190D 2.2, "Eva, Brown Benz", 142K, 40.2 MPG
'77 240D (parts car)
'67 Eicher ES 202 Tractor "Otto" (2cyl, Air Cooled, 30HP)
Gassers:
'94 Ford F-150, "Henry", 170K (300 Six) 17.5 MPG
'85 190E 2.3, 148K....Parts Car
'58 Dodge W300M Powerwagon (Flat Fenders) Less than 10 MPG