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Originally Posted by Mike Murrell
Your original post referred to a "CIS temp sensor". Never heard of it. Maybe you meant "coolant temp sensor"...whatever.
Coolant temp sensor - in most cases - located at back of cyl. head. If this is what you changed, I'll assume it's performing as intended.
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Apparently, there are two coolant sensors. The one I replaced was labeled as being for the "CIS Injection" and can be seen here:
http://63.89.49.212/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1Q0133BYD1RM0REJXO&year=1991&make=MB&model=190-E-004&category=C&part=Water+Temp.+Sensor&appEngines=12-059352-
Along with the "K-Jetronic" water temp sensor, which I have not yet replaced.
Is there a test I perform on the "K-Jetronic" sensor to see if it's bad before I replace it? It's $65, so I don't want to replace it without knowing that it's bad.