My car (1986 190e) has a 110degree sensor. This is an item I would buy new, rather then at the boneyard. you can test the fan's function just by grounding the sensor (you know this, but others may not).
Hi I have a 230E that I am trying to solve overheat fault for a friend, I found that the magnetic radiator fan did not seem to cut in when idling and gauge shows 100'C. Took out switch in head, found it was a pirate switch made in Italy and showed temp of 85'C. Tested switch in boiling water with multimeter - no continuity at all. Bought second hand switch from scrap yard, original merc but is stamped at
100'C. Tested and found working in boiling water but only after quite a while. Installed in motor and tested. Car reached 80'C while driving and then 100'C at idling quite a while but fan still did not cut in. Ambient is pretty cold now so maybe it needs a higher ambient before it cuts in. Any advise please. James
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