"Monkeying Around" with a Mercedes Thermostat (A La D.G.) is not a solution
to your Problem (Or anyone else's).

Mercedes Cooling Systems are Very,Very Complex and not to be "Altered".
[Certainly not by the Instructions of Some Self Appointed Internet Barnum]

The Problem is not the Thermostat's Design ,although you may very well have
a BAD Thermostat.

'Find out the Real Problem and Fix it.

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'84 300SD sold
124.128