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Old 06-12-2001, 12:22 PM
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Does anyone know the exact procedure and tools
necessary on checking and or replacing the engine
sensors (e.g. temperature sensors, etc)? Want to check
these on my 85 500SEC, but don't know what the
procedure is, or how to replace them. I'm thinking of
replacing all of them, since I suspect that one or
more of them may be bad (temp.fluctuations, etc), and
wanted to know the exact procedure for doing this. Can
anyone tell me what the major ones are, and what I
should be looking for to warrant replacement? Also,
how do you properly test the engine fan clutch
on this car?
Thanks in advance for your replies!

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Old 06-12-2001, 07:04 PM
JimF's Avatar
'94 S500: only 793 sold!
Join Date: Mar 2001
Location: San Diego, CA
Posts: 1,933

Get a CD-ROM for your car. The data, including resistance values vs temperature are including.

This way you can test them with just an ohmmeter. If the value of the ECT is ok at, say 20C, then most likely it's a good sensor.

Check ALL-DATA/PM for a CD: Here's the link:

Regards . . . . JimF
'94 S500 Cpe

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