E320 Coolant Warning Message
 

Started the 97 E320 yesterday and the Coolant warning message showed up on the display.

Knowing that I had checked it earlier in the week along with rest of the fluids, it made me wonder.

Temp reading is mormal right above the 80-84 mark, and doesn't move.

Got home and checked the tank. Seemed OK but thought it was just below the sensor. Dropped in some coolant, less than pint total.

Started it back up and reset the warning indicator. All well.

Till I shut it off and the warning came back each time.

Car is running as cool as expected and showing on the gauge.

Wondering if there is something wrong with the sensor???

On my 400 it was visable on the side of the tank. With the 97 and black tank I didn't see it .
1. Has anyone else expirenced this?
2. Where is the level sensor?
3. is it a sensor that can be checked with a multi meter?
4. Is there another reset procedure, i.e dropping the battery or something else?

Thanks,
Mike

Hold on!!! This may not make sense, however the W/S washer sensor is in series with the coolant tank sending unit. Almost 99/100 the w/s washer sending unit goes bad & causes the coolant lamp to stay on.

Doc,
I'd believe it. A question then would be? If it's low on washer fluid would it show low coolant?

The coolant level is an "on-off" circuit & the washer circuit is a variable resistance circuit. SO when the coolant is full the instrument cluster sees a the variable resistance from the w/s reservoir & knows all is well, HOWEVER if either the coolant is low OR the washer sensor goes OPEN circuit then the coolant light comes ON.
You need MB part number 210-540-00-45!

Thanks DOC.

I know this sounds dumb, but I didn't see the sensor from my initial look at the tank.
Is this where it is located or some other obscure place?

Again, Thanks for taking the time.

Mike

Successful conclusion
 

DOC,
Again, You were right on!

Bought a sensor, dropped it in the washer tank (I was looking in the coolant tank) and Viola!! Message disappeared.


Thanks a bunch !

Mike