It rained pretty hard tonight. I have a puddle of water in the passenger foot well. I don't know what could have caused this other than my hood cowl being cracked on the passenger side. Any ideas?
The sunroof seal isn't intended to be completely water tight. There are four drains to carry away any water that makes it past; they come out in the rear fender wells and the front door jambs. The front ones most frequently clog; you can find the tubes and see if water is coming out.
It's also common for the drains under the battery in the water plenum to clog; that will put water in the footwell. Remove the battery and the tray to find one, look under the brake booster for the other.
Finally, the seal around the cain air filter (also in the water plenum) can leak.
You want to get that water out ASAP. Two of the computers that run your car are under the carpeting in the footwells.
Me too got water in the Drivers carpet, clogged sunroof drains. here is a really nice fix thread:
I took a look at the "duck bill" drain that is in the passenger side door jam. It has been clipped by the previous owner. I took some weed eater line and fed it up from the "duck bill" drain. The line went all the way in. I could feed all of the line. So, I fed it from the top right side and it was clogged about 2~3 feet down. I poured some water into it... nothing came out of the door jam. I poured some water into the driver side drain, and the water poured out of the driver side "duck bill" like it was the Niagara falls. Holy Cow. I even tried to blast the clog out with the air compressor but no luck. I saw the water drip out from the underside of the car. There is this horrible smell. MOLD!!! Any ideas?
You may have the dreaded "disconnected drain hose". The actual VW repair technique is to try and snake it out with the core from a speedometer cable - it's just the right size and stiffness. HOWEVER, if you're not careful you can poke too hard or at the wrong angle, and disconnect the hose from the fittings. (A previous owner may already have done this) Then you have to take the "A" pillar apart to re-connect it.
I don't know of a DIY specifically, but you might want to do a search here and at PassatWorld; I've seen it discussed. I haven't faced this problem, but if your car is a later model with an airbag in the "A" pillar, I'd seriously consider letting the dealership deal with it. I have no idea what they'd charge; I'll guess they'd just see how long it takes. Otherwise, I'd just start taking it apart. The cover just pulls off, starting from the top. The clips may break (they're considered "one use"), but new clips are available at the dealer.
The drain problems should be covered by P9 recall