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Q:

vehicle overheats on 1994 Mercedes-Benz S420

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Have replaced the theromstat and water hoses.
(3) Answers
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I forwarded an article with pictures and text regarding cooling systems and overheating problems to the email; address you posted this question from.
Best thing to do is to first get a really good temp reading from the engine to make sure that it is not the gauge reading incorrectly. ( happens ) Then check your fans. Are both of them working as they should ? How old is your radiator? Lastly, do a block check and a radiator gas check for any exhaust gases in your coolant, to rule out any head gasket complications. Good Luck!