windshield washer fluid temperature - Mercedes-Benz Forum
 
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post #1 of 7 (permalink) Old 05-13-2019, 06:20 PM Thread Starter
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windshield washer fluid temperature

I am not sure if I have a leak in the heating coils or thermostat in the windshield washer tank - and am losing fluid and no visible leaks. What should the temp of the ww fluid be when the car is at operating temp? Since I live in South Florida, think I can loop the lines and take the heater out as I hope never to need heated fluid. In order to see if it is leaking coolant into the ww tank can someone tell me the temp it should be at when the system is working properly? If it is too hot I have my answer and will make the necessary steps to correct.
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post #2 of 7 (permalink) Old 05-14-2019, 04:54 AM
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It will reach the same temperature as the coolant - 85 deg C. In Florida you certainly do not need it, maybe in Alaska
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post #3 of 7 (permalink) Old 05-16-2019, 01:07 PM
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I am in So CA and had a thermostat leak in the washer reservoir. I could see the color difference in the fluid. I simply pulled the faulty hardware out and used copper pipe to bridge my coolant line outside of the washer reservoir. Its been over a year and now issues. My Indy said copper would be fine so I went with it.

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post #4 of 7 (permalink) Old 05-16-2019, 01:30 PM Thread Starter
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I think that is what I will do when I get the cooling issues settled. One less thing to worry about.....
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post #5 of 7 (permalink) Old 05-16-2019, 01:31 PM
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Quote:
Originally Posted by rorypff View Post
It will reach the same temperature as the coolant - 85 deg C. In Florida you certainly do not need it, maybe in Alaska
The heating coil has a thermoelement at the end so the water will never reach the coolant temperature, which would crack the windshield in winter...
Btw the element is sometimes stuck, leaving the washer reservoir cold...

To check wether there is a leak, just remove the water, and see if it fills with coolant...

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Last edited by Frank_S500; 05-16-2019 at 01:33 PM.
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post #6 of 7 (permalink) Old 05-17-2019, 04:22 AM
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I saw where there were heating elements in the washer lines from the tank to the 2 squirters that's controlled by a module in the driver's side of the hood, but I always thought engine coolant was circulated unchecked through the stainless coil in the washer tank.

The washer lines have built in resistance wires that keep the lines from freezing during winter, but what controls the coolant flow to the stainless coil in the washer tank?

I guess I could check the washer tank temp after the car warms up to see how hot it gets.
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post #7 of 7 (permalink) Old 05-17-2019, 06:41 AM Thread Starter
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I used my infrared thermometer to check the wash tank fluid and it was @ 180 degrees - seems quite hot to me. Is this normal or what temp should it be kept at?
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