Hello,

I have attached an image of the item.

Looked on the forum and the service manual, but I could not find a definite answer. What I gathered is that this sensor is located on IP side of the engine closest to the vacuum pump can someone verify this for me? The sensor(s) currently on the engine look nothing like this new part.

Thanks,
Taylor

Attached Thumbnails

 

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'84 190D 2.2 OM601.911 144K

On the thermostat housing next to the EGR's vacuum tubes.

The one between glowplug #2 and #3 and the the one on top of the thermostat housing looks the same on my car but looks different with the picture you provided.

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'85 300D Cal 280,000 miles
'14 GLK 350 60000 miles

On a 617 diesel the coolant gauge sender (for on the dash) is on the side of the engine between the #2 and #3 glow plugs.

The blower-cut-out sensor switch for the klima is on the thermostat/egr housing area on the front passenger side of the engine.

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-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)

To be more specific this sensor is the "Cooling Fan Sensor; Auxiliary Fan Switch; 212 Degree F"

One person says it goes on the water pump another says between #2/3 GP

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'84 190D 2.2 OM601.911 144K

Only the W116 300SD (79-81) had that switch. W123 and W126 models don't have one.

Well it's in the parts catalog that it goes with my car which is a W126

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'84 190D 2.2 OM601.911 144K

My vote is right on the thermostat housing!

Sorry about the huge picture, but here it is circled:

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http://i106.photobucket.com/albums/m...73378_30-1.jpg

It covers lots of models and shows many part options not available.

Nope, wrong sensor. That is the heater lockout switch.

The switch is used only on W116 models, is outside the thermostat housing and is circled in the first picture attached. The second picture is of an 84 300SD like the OP, note the lack of switch.

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See for yourself its in the parts catalog for this vehicle.. Now If I can just figure out where the Aux Coolant sensor switch goes.....

http://catalog.peachparts.com/ShopByVehicle.epc?q=&yearid=1984%40%401984&makeid=63%40%40MERCEDES-BENZ%40%4063%40%40MERCEDES-BENZ%40%40X&modelid=6208%3AMBC|1510%3AED|10000134%40%40300SD&keyword=switch&subcatid=P:241005@@Auxiliary+Fan+Switch&mode=PA

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'84 190D 2.2 OM601.911 144K

You. Don't. Have. One.