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A4 Quattro
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Various Probelms Caused by Clogged Plenum Tray Drain on Audi A4 Quattro

Problem Description and Possible Solution

Clogged drains can allow rainwater to accumulate in the plenum tray (at the base of the windshield). The water may leak into the vehicle's interior, brake booster, or electrical components, which can lead to major problems. Our technicians recommend keeping the tray clear of leaves, pine needles, and other debris.

Problem Data
RepairPal Verified
Average mileage: 139,500 (65,000–260,000)
11 model years affected: 1996, 1997, 1998, 1999, more2000, 2001, 2002, 2003, 2004, 2005, 2007
24 people reported this problem
Comments
Viewing 1 - 9 of 9 comments
Dealt with this issue more times than I care to discuss!The water begins to impact electrical system so stay on top of this! The final solution was to get rid of the rubber drain plugs (one is under battery, other is near brake servo) to allow the water to drain better. Also, blow out the area w/ a compressor every couple of months.
Had water in car on floor in back--was after heavy rain. Never knew there was this tray. Mechanic said it was clogged with leaves (it was autumn)

KEEP THIS Tray CLEAM!! took over $1000 to fix everything following water damage!
Water was draining into the car on the left hand-side and causing major flooding inside to the point where I felt I was the Captain of the Titanic. The cause was the drains in the plenum at the base of the windshield not draining fast enough and then overflowing into the pollen filter housing and traveling through the vents to the inside floor. The solution was to remove the small drain hose that passes through the rubber grommet in the center of the plenum. The little drain hose is still connected at the source near the pollen filter but the rubber grommet was chocking the hose, so by pulling the hose out of the rubber grommet and letting it drain into the pelnum it drains faster and has worked well for the past few months. I might try to further increase the drainage capabilities by removing the rubber grommet completely as suggested in other posts. Good luck to you all.
2005 Audi A4 3L Quattro Car has been a nightmare... No, I take that back...the Used Car Dealership, their so called " authorized" Audi mechanics, and the 8 mechanics I've brought car to in the last 3 years since driving off the lot has been a nightmare. One of the many issues just noticed on this site...rainwater draining and collecting under hood below windshield ..leaves twigs leading to major electrical problems... I told these guys something not right with the engine the day I drove it home...additional problems surfaced I believe had to do with rain water collecting last year. I was told no...couldn't be this. I'm female, petite, older....and ignored. However, the cost of this car and endless problems are consuming my pay as a teacher and have put me in harm's way too many times...I still owe on it and no one will take as a trade in, refinance....Had to use a 50cc scooter to get to work for awhile...until I could pay off the failed AC compressor and timing belt replacement two months ago. I guess Grandma is going to have to try to fix what she can herself and print out all the signs, symptoms, and possible diagnoses , highlight in yellow and hope visit to shop Monday is not the water pump or blown gasket, oil cooler but just another sensor failure... Red Coolant Flashing light at stop light or in traffic. Temp gauge normal doesn't go beyond midpoint, coolant level adequate...but I can smell something that I don't think is normal.. I still owe 10k on this car...I got ripped off...desperately needed a car , life happens..A difficult time and made a big mistake trusted a used car salesman and the "authorized' Audi mechanic at the lot. Odometer said 58k at purchase but now I'm really questioning the validity of these numbers...interior began falling apart not long after purchase, glove compartment fell off seat backing panels too...seem to have been glued on. Awful...
I have not found a solution yet, please help! my windows now do not work, electrical issue and my car is flooded inside