He is more than right about removing thermostats. On some cars removing them can remove a problem and assure an open flow to the radiator. Most German t-stats including MBs are built so that as the valve opens the passage to the radiator a second plate moves over the by-pass hole. By removing the t-stat the water is free to flow where ever it choses. This reduces flow and can cause serious overheating as some of the coolant just circles the motor.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician