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BMW X5 Wet Floorboards

Kaka on Thu May 26, 2011 10:16 PM User is offline

Year: 02
Make: BMW
Model: X5
Engine Size: 3.0
Ambient Temp: 80
Country of Origin: United States


New to the forum hope someone can help. Have an 02 X5 with soaked rear floor boards, after taking the car apart found water coming the lower front vent that supplies the rear seats. The water of course only comes when ac is on. No wetnees during winter months. Have cleaned the drains both sides and they are open, also cleaned the cabin filter housing drains etc. The water appears to be from the top of the evaporator. The left drains more than the right but have threaded a trimmer line up both and blown compressed air without any resistance. At the end of my rope, the only thing left to do is take the dash apart and open up the housing but that would require a boat load of work. My father has an 03 and the same issue. Both smell musky like a locker room.

Any recommendations would be greatly appreciated.


NickD on Fri May 27, 2011 10:31 AM User is offline

Not a peculiar problem to just BMW's, like all vehicles, as a leaf/debris chopper, sometimes mistakenly called a blower motor that piles up debris on the face of the evaporator that falls off and piles up on the drain hole. Running a wire underneath does not cure that problem, not removing the debris, just spreading it around.

With luck can just remove the blower motor and get in there to clean that out, this I don't know on your car, I live in Ford country.

Only cure for that stink is to kill your compressor with the blower running full blast five minutes before you get there. Some aftermarket stuff is available to run your blower motor with a timer for at least five minutes after you kill the engine to dry out your soaking wet evaporator. Also greatly extends the life of your evaporator.

GM Tech on Fri May 27, 2011 10:47 AM User is offline

Do your drain tubes commence horizontally or vertically? If horizontally, you need a rubber elbow such that it ends vertically. Air pressure will cause it not to drain while driving....a very well known automotive industry fact.

The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

Edited: Fri May 27, 2011 at 10:47 AM by GM Tech

Kaka on Sat May 28, 2011 8:46 PM User is offline

Thanks for the replies, I blew compressed air through the center lower vent that feeds the rear when the console is in with the console taken apart. It doesnt allow seeing the whole evaporator but you can get into the housing. There is no major debris seen but I'll take a better look thanks. As for the drains they do end horizontally but I've been working for days on the car without moving it and the water still pours out that center lower vent. I will however add an elbow to make it end vertically makes sense. Any other suggestions would be greatly appreciated.

NickD on Sun May 29, 2011 5:51 AM User is offline

Based on the assumption that this problem just started recently and the drains were once properly working with a huge puddle on the garage floor. Also ran into a guy that thought his evaporator drains was the problem when the real problem was rain water pouring with a defective weather strip seal. His solution was to drill a hole in the evaporator housing on the firewall side. Wasn't a good idea, when too far and drilled a hole in the evaporator. That was a true blast.

Already have back blown systems, remove the blower motor and stick in the inlet of a large shop vacuum in the blower motor hole, but used a leaf blower into the dash vents. Talk about a major dust storm. Air compressors have the pressure, but not nearly the air volume to be effective. Other vehicles, have removed all the duct work and used soap and water, can really find one hell of a mess in there. See they finally started to add replaceable inlet air filters.

Really don't consider myself to be a tech, a janitor is far more like it.

Edited: Sun May 29, 2011 at 6:02 AM by NickD

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