Your thermostat is located under the metal end of the upper radiator hose that terminates on the top of your engine. Three 10mm bolts I believe. Easy to do.

There are several centigrade ratings, make sure you get the one that is rated for you car. Dealerships use the vehicle's chassis number.

Haasman

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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)