I have a mercedes 420sel 1988 where is the thermostat located on the bottom or the top big radiator hose?

I want to change the thermostat but not sure if it is connected to the top or bottom of the large radiator hose
I have a mercedes 420sel 1988 where is the thermostat located on the bottom or the top big radiator hose?
Neither, it's on the side of the water pump housing.
I have a mercedes 420sel 1988 where is the thermostat located on the bottom or the top big radiator hose?
All i ever seen was in the top.

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