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Gently squeeze this drain hose (7 in diagram) in an attempt to free lodged debris without disassembly. If this fails, check drain nozzles behind both front fenders if so equipped remove them permanently and ensure there are no obstructions in drain exits. If problem still exists you will need to remove water collector to clear drains top to bottom.
Thank you very much, Konigstiger - this was very helpful. Tried to squees the hose, and the water came back up. I imagine there is something stuck high up in the system. I`ll try to remove the 3 nozzles tomorrow, but i`m afraid this is a bigger operation. Maybe I`ll try with a stake spring or an aircompressor. Good to have something to work on this Easter...
Thanks for good help, Konigstiger. On this pics you all can see what the error was. The hose was flat and did not go through the chassis. Now everything is fine.
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
