Please help with part numbers / Aux fan switch 300D W123

[79300D]

Can anyone tell me which part number is the correct sensor for a 1978 300D, auxillary fan temp. sensor at the thermostat housing?

005-545-03-24

006-545-14-24

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.

Help!

Thanks

Jeffrey


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]

[RunningTooHot]

This probably isn’t going to help you unfortunately, but I’m just blowing off some steam – 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., I’m 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This part may have been superceded though, so beware of this fact.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, wasn’t it?

Sorry
RTH