230E 1984 Fan Switch

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jamsan - 22 Jul 2005 17:46 GMT

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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Martin Joseph - 22 Jul 2005 18:01 GMT

> Hi
> I have a 230E that I am trying to solve overheat fault for a friend,
[quoted text clipped - 10 lines]
> pretty cold now so maybe it needs a higher ambient before it cuts in.
> Any advise please.

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).

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Wan-ning Tan - 23 Jul 2005 05:17 GMT

Yeah, just grounding the sensor should activate the magnetic clutch
(i.e. fan is hard to turn by hand. Oh, make sure engine is NOT running

:-). If fan is loose, check if there is voltage on the clutch socket.

If there is 12v, the clutch is bad.

>> Hi
>> I have a 230E that I am trying to solve overheat fault for a friend,
[quoted text clipped - 15 lines]
> 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).

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