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  #1  
Old 10-27-2003, 11:40 AM
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W124, 92 400E, windsheild washer heater thermostated?

Yes, I did the search for windsheild washer fluid heater coil, but there seems to be conflicting information about the coil being thermostated or not and I would like to know before I take mine apart. Does anyone know for sure if it is thermostated or not for W124, 92 400E. My windshield washer fluid gets very hot, sometimes it boils the washer fluid, I have not noticed it before and I want to take care of it, I do not wish to bypass the coil.
I guess by my description of the problem I have answered yes (it is thermostated) to my question but stil I want a confirmation from someone who knows. Thanks all.
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Old 10-27-2003, 01:33 PM
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I remember reading a post long time ago mentioning the washer fluid heater is thermostated for 170F.
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Old 11-06-2003, 01:17 PM
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It is thermosted!

I did replace the heater coil in the windsheild washer fluid reservoir (got it from Phil at Fast Lane ~ 105 plus couple of rubber seals (grommet) for the tubing). The coil is in three parts actually, two tubings one is coiled, both tubings attach to a thermostat. My washer temperature now is ~34C or ~93F.

Car 92 400E 167K mi. W124 M119
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Old 11-06-2003, 02:05 PM
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Question What exactly is the deal???

I know the fluid is heated, and I see the coils going into the tank. I also see electrical wiring going to the actual jets in the hood. How does the system work? Are the jets and the fluid heated electrically and sort of mechanically? I would like to know how it works. My Range Rover has heated sprayers, and they are only electric (no coil in tank) controlled by the outside temp. 2 years ago they worked, now they don't. The Benz idea seems better, more reliable. The Rover also has tiny wires in the front windshield that you can electrically heat it instead of waiting for the defrost. How are the MB locks in the winter? Do they ice up and freeze? They do on the Rover, but then again if you pull out the door handle it electrically heats the lock and you can open the door. That, fortunantly, still works.
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Old 11-06-2003, 03:11 PM
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TROVERMAN - the way it works as I understand it is, the windsheild washer fluid is heated with the engine coolant. the washer fluid heating coil is in paralel with the car interior or cabin heater/radiator. The auxiliary coolant pump, pumps coolant to both systems if the main water pump is not sufficient, I do not know how the auxiliary water pump is controlled, by what signal or trigger, is it from the RPM sender to the ambient temperature cotroller pushbutton unit?

The thermostat controls the flow of coolant in the washer reservoir coil. If the temp of washer fluid is below ~34C the thermostat is open and collant flow through the coil to warm it up and when the washer fluid temperature is over ~34C it stops the flow of coolant through the coil. In my case the thermostat was always open and sometimes the washer fluid would boil.
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Old 11-06-2003, 06:49 PM
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O.K., thanks--any idea about the wiring that goes to the actual washer jets??
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