Hey Guys, I put on a new Water temp sensor on my 91 300E. Fits fine but I;m not sure how to configure the pins on top of it with the connector. The Sensor just has 4 pins and are not numbered like the sensor cap. How do I know if this things on right? And what is that ticking noise that comes and goes from the back of the engine near the firewall? It's not always there. Thanks for your help again! If I get this thing running right, it's getting a paint job, tinted windows, and stero system baby!!! Oh, and some new seat covers after I pad the old ones up. Everything else works on this baby.

From memory it does not matter which way you hook it back up.

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I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]

Interesting because it has a flat side on the connector and numbers on on the connector pin but no flat side on the temp senser and no numbers. Well, I jist stuck it on to wear it seemed to fit best. Hope it's right

Thanks a lot!!!

Agree, it doesn't matter. That component consists of 2 identical sensors (negative temp coefficient thermisters). Each sensor comprises a pair of diagonal pins consisting of a signal pin and a ground pin, one pair providing signal to the EZL control unit and one pair sending signal to the KE control unit.

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1988 California version 260E (W124)
Anthracite Grey/Palomino
Owned since new and still going strong and smooth
MBCA member

Past Mercedes-Benz:
1986 190E Baby Benz
1967 230 Inherited from mom when she downsized
1959 220S Introduced me to the joys of keepin' 'em goin'

There are only 10 kinds of people in the world--those who understand binary and those who don't

Thanks for the help. I will not worry about it then. It's a new Temp Sensor so I thought I had missed how the original was put on but it seems to work fine.