Any idea what is the running temperature of a 190D? Mine is always at around 100C. I am not sure whether the electric clutch fan cuts in or not. I know the fan works as I gound the connector at the thermostat switch ( on top of engine block ) and the fan kicks in.

Questions:

1) Would overheating damage the head on the 190D, similar to the infamous #14 head?
2) What is the cut in temperature of the thermostat switch on top of the engine block, 100C, 105C?
3) There is a thermostat switch on the left side of the engine, half way down the block, any idea what is that for?

Any info is appreciated.

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Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed.

W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html

1 X 2006 CDI
1 x 87 300SDL
1 x 87 300D
1 x 87 300TDT wagon
1 x 83 300D
1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry.