How do I remove this front drain tube - Mercedes-Benz Forum
 
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post #1 of 7 (permalink) Old 04-14-2019, 06:50 PM Thread Starter
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How do I remove this front drain tube

When I bought my car about 18 months ago, the drains in the cowl beneath the windshield were blocked. I was able to clean them out with the exception of the drain that is about two feet from the driver's side of the car. It is between the two windshield wiper arms and to the right of the plastic engine cover. (I have attached pictures showing the location.) I have used water, compressed air and various objects such as coat hangers. While I have been partially successful and some water drains through, it takes a significant amount of time to drain and more effort is needed.

On Saturday, I attempted to remove the tube from above and underneath the car on the theory that I might be more successful cleaning the tube when it was off the car. (I had to remove a similar tube that ran near the battery so that I could clean it thoroughly.)

I cannot tell how it is supposed to come off, so I only used mild force to avoid breaking anything. Does anyone know whether it can be removed, or how it is attached? If it can be removed, should I pull it forward (away from the firewall) or pull it up?

Thanks in advance.
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post #2 of 7 (permalink) Old 04-16-2019, 01:58 AM
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I had the same problem ,the tube gets narrower as it goes does down so it trapped some small pine cones and debris from trees.
Rather than removing it , first try this.
Where you have it separated from the port , tape on a suitable vacuum cleaner nozzle attachment,,,turn it up to full power and switch it on....
it worked really well for me.
The tube is difficult to remove I think , but if this works you don't need to remove it.

It is important to have these drain tubes clear to avoid rain water getting in where it should not.

Last edited by Benzyle; 04-16-2019 at 02:01 AM.
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post #3 of 7 (permalink) Old 04-16-2019, 06:42 PM Thread Starter
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Thanks for the suggestion. I used your method tonight and kept the vacuum attached for about 5 minutes. I poured a cup of water in the drain and it is still clogged. Some water drips through, but it is very slow.

I am going to find some plastic tubing to snake into the drain and attack the clog more aggressively.
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post #4 of 7 (permalink) Old 04-16-2019, 08:06 PM
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A pity it didn't work for you.
It must be really clogged up.
If the plastic tubing doesn't work , maybe try a little caustic drain cleaner to dissolve the blockage....
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post #5 of 7 (permalink) Old 04-16-2019, 08:07 PM
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A pity it didn't work for you.
It must be really clogged up.
If the plastic tubing doesn't work , maybe try a little caustic drain cleaner to dissolve the blockage....
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post #6 of 7 (permalink) Old 04-17-2019, 02:30 PM
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I’d try blowing air from below. If it narrows as it goes down, anything you do from above will likely pack the blockage tighter.
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post #7 of 7 (permalink) Old 04-17-2019, 03:48 PM
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You could make one of these:

Air chuck with 1/8 x 1/4 hose connector plus as much 1/4 hose as you need. End is cut at an angle.
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