Indeed it should. You most likely need a new thermostat. It pretty cheap and easy to replace. I had the same problem with my 16v, after a new thermostat 80C all the time. Good luck

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Bart
1987 300SDL-T
1985 190E 2.3-16
1984 280GE Cabrio
1978 240D
1957 220S(running one day, I hope!)