Water Temp Sensor?????

Michael,

Sorry, I've got to get ready to go out with my wife.... now!

[] MBL

The sensor in your top pic is for the cold start injector, when it makes contact your injector fires. The temp sensor for the dash is the single pin on the thermostat housing. THe other is for the CIS E Sytem as part of it's input for adjusting the A/F ratio.

Hope that helps!

Jonathan

Michael - the injection system engine temp sensor is at the rear of cylinder head on left (drivers) side - it is connected by a green wire with a red stripe.

More info here:

http://mercedesshop.com/shopforum/showthread.php3?t=107902&highlight=temp+sensor

Sorry, I was thinking M117 not M103..My bad for not looking:-/

Jonathan

I swapped this out today. You need a deep socket that fits the temp sensor. You also need to unbolt the engine pull bracket that sits at the very end (firewall) of the block - so that you can get to the sensor.

Pulled the old one out, a tiny bit of coolant ran out, then stopped, popped the new one in (with a new washer), hooked up the 2 connectors (doesn't matter which side they go on). The car fired up on the first try in 30F weather - NO way it would have ever done that before.

The new temp sensor had clearly been re-engineered compared to the old one. The sensor piece was longer and the connectors were green instead of black. So hopefully it won't die like the last one.

Ok in that picture, starting at the engine bracket on the driver's side of the block, the sensor is going to be the very first thing you run into on the block - hence having to remove the bracket while getting the deep socket on the sensor.

Big pic of the sensor:
http://images.autopartsworld.com/live/C602012903BOS.JPG