I purchased this coolant temp sensor:
http://catalog.peachparts.com/ShopByVehicle.epc?q=&yearid=1995%40%401995&makeid=63%40%40MERCEDES%2DBENZ%40%4063%40%40MERCEDES%2DBENZ%40%40X&modelid=6392%3ABT%7C5%3AMBC%7C1508%3AED%7C10000022%40%40E320+Sedan&keyword=sensor&subcatid=P:240675@@Water+Temp%2E+Sensor&mode=PA

It is supposed to be on the thermostat housing. But the only sensors there are a one-prong sensor for the dash gauge, a four-prong/blade sensor for something else. (Don't know purpose.)

Where is this sensor? Or do I have the anomaly car that does not have one?

Attached Thumbnails

 

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2008 E350 4matic / Black/Anthracite

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Gone but not Forgotten:
2001 E430 4matic, 206,xxx miles, Black/Charcoal
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black

You purchased the incorrect sensor.
The correct one for a 1995 engine has 4 spade connectors.

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MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator

Great -- thanks.

The four-spade is what I saw. Will swap it for the correct one.

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2008 E350 4matic / Black/Anthracite

------------------------------------
Gone but not Forgotten:
2001 E430 4matic, 206,xxx miles, Black/Charcoal
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black

OK Wait --

Called my local dealer and they said the thermostat housing has the one-prong sender for the dash gauge, and the four-spade is for for the aux fans.

I saw a diagram with another one sticking out sideways (I believe for a 1994 car), but I don't have that on my thermostat housing -- just a flat bolt sealing what could be a potential opening. So which one connects to the fuel injection/ECU system?

__________________
2008 E350 4matic / Black/Anthracite

------------------------------------
Gone but not Forgotten:
2001 E430 4matic, 206,xxx miles, Black/Charcoal
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black

I see this is going to be my weekend challenge!

I've been calling around and nobody knows where this sensor is hiding.

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2008 E350 4matic / Black/Anthracite

------------------------------------
Gone but not Forgotten:
2001 E430 4matic, 206,xxx miles, Black/Charcoal
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black

You have a 95 version..that sensor combined the two sensors into one...so you need the 4 pin sensor...simple.

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A Dalton

Ahhh.... Thanks.

So the squarish, 4-blade/spade sensor sitting in plain view on top of the thermo housing is it? (I was assuming there were two wires for one fan and two for the other, but now I recall that they both turn on/off together, never separately (or so I have noticed).

__________________
2008 E350 4matic / Black/Anthracite

------------------------------------
Gone but not Forgotten:
2001 E430 4matic, 206,xxx miles, Black/Charcoal
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black

This part shows up in searches by 'engine coolant temperature sender' rather than sensor. The correct part # for the four spade connector sender on the water pump is 011-542-51-17.