Windshield Washer Reservoir Won't Hold Fluid - Mercedes-Benz Forum
 
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post #1 of 7 (permalink) Old 03-03-2019, 03:40 PM Thread Starter
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Windshield Washer Reservoir Won't Hold Fluid

My 2003 S500 won't hold washer fluid. Within a few minutes of filling it up, the tank is completely dry. I've read prior posts that point to the hoses and grommmets, and actually I also have a 2001 S430 with a similar problem: Its tank also loses fluid but only above the point where the hose is connected. Since the S500 loses all of the fluid, I'm thinking it's probably not a hose or grommet problem but the tank itself....Wondering if the group agrees with my assessment.
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post #2 of 7 (permalink) Old 03-03-2019, 03:42 PM
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Sorry for the issue... If you find leaks underneath the car, tank may be cracked right under.


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post #3 of 7 (permalink) Old 03-03-2019, 04:10 PM
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My car had this issue last year, and I first suspected a cracked tank. However, on inspection, it was fine. The culprit was a cracked headlight washer housing. If you remove the undertray at the bumper you can look up at the washer tubing and housing, and you can also look up at part of the tank. Hope this helps

Regards, John
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post #4 of 7 (permalink) Old 03-03-2019, 05:48 PM
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Willing to bet it is the connection at the tank to the hose, it looks almost like a t connection. The replacement part is a new distribution line, about $150 (plus or minus) and about 90 minutes labor.


I did the job and spent the money. Had the same issue on another w220, and found a retrofit for about $4. A piece of vacuum tube over the connection, coated in gorrila glue, placed over the nipple is a great solution. Gorilla glue is a good match as it is water activated. I am working out of state, will send a picture of the retro repair in a week if interested. I am 99% sure this is your problem.
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post #5 of 7 (permalink) Old 03-03-2019, 08:08 PM
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I recently had the fluid leaking out of my car as well - and spot where the line connects to the pump had a slit through hose that attached to the nipple. It would just slowly loose all the fluid.

I did put some plastic repair tape over it and found another issue after that - where the line would just disconnect from the nipple. I used a few zip ties to hold it in place - a total red neck solution for now - but it is working alright.

I think I might look at adding some new vacuum hose and some glue to that spot - I bet that would do the trick in my case.

-04 S430
-04 Terminator
-16 T&C (whole family van)
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post #6 of 7 (permalink) Old 03-04-2019, 07:38 AM Thread Starter
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Thanks (to everyone) for the replies.....And yes I'd love to see that pic when you get back home and have a chance to send it.

Thanks.
John
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post #7 of 7 (permalink) Old 06-09-2019, 12:08 PM
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My Mickey Mouse fix ended up not lasting long. I took it all apart and made what I hope is a much more permanent solution to the problem I had. I made a video - hopefully it helps others:

Essentially Replaced the connection to the Windshield Washer motor with a Tee connection and a little bit of hose and some Window Weld to seal off the one side were the heater cable is threaded through...

-04 S430
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