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First release pressure fromradiator cap. (Best to do with the engine cold) Locate the thermostat housing at engine end of top radiator hose. Remove 3 10mm bolts on housing. Remove housing. Remove thermostat. Fill engine with coolant directly below thermostat. Install new thermostat. Locate small hole in thermostat and line up with the highest point of housing. Reinstall housing. Fill radiator expansion tank with fluid. Reinstall radiator cap. Start engine with heater on. Watch the temp gauge til up to normal temp. If it continues to rise shut the engine off (do not overheat). If it does overheat check fluid and try again. If it keeps running too hot the system will need to be bled.

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15y ago
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Q: How do you change the thermostat on a 1993 Mercedes Benz 190 e 2.6?
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