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Old 07-10-2001, 06:55 PM
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Join Date: Apr 2000
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Can anyone tell me which part number is the correct sensor for a 1978 300D, auxillary fan temp. sensor at the thermostat housing?



The old part looks absolutely nothing like either of the two new ones. One has 212 stamped on the side, and is a little switch, while the other is larger, but with one pole as well.




Also, the larger sensor has 7G F 3131 stamped into it, the smaller, 4/0 185.11 100C

[Edited by 79300D on 07-10-2001 at 07:01 PM]
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Old 07-10-2001, 07:33 PM
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This probably isnít going to help you unfortunately, but Iím just blowing off some steam Ė Pun definitely intended. I have been having some cooling system frustrations during the last few days.

I discovered that on my car, a 1984 300D (California version, if it matters in this regard). There is NOT an auxiliary fan thermo-switch anywhere on the engine. The wiring diagram shows that the fan is activated ONLY by the switch on the A/C receiver-dryer. (via the relay, of course.)

O.K., Iím finally cooling off here. The 212 is degrees (boiling point in Fahrenheit). This is curious, as I would assume that it would be stamped with a Centigrade rating like the other one you mentioned (100 is the boiling point in Centigrade), but what do I know?

I just looked in my ANCIENT (circa 1983) parts book from SSF, and the part number listed as 005-545-03-24 is listed as: Thermo Time Switch / Coolant temperature sensor, 1 pole terminal, for ready to start indicator light at dash via preglow relay system. Used on 300D with OM617-912 engines up to #114041.

This part may have been superceded though, so beware of this fact. I see no listing for the other part number you listed, but this book is 18 years old.

Now, in retrospect, this was a pretty useless reply, wasnít it?

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