Various Probelms Caused by Clogged Plenum Tray Drain on Audi A8 Quattro

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.

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Average mileage: 115,191 (55,000–177,000)
11 model years affected: 1997, 1998, 1999, 2000, more2001, 2002, 2003, 2004, 2005, 2006, 2008
28 people reported this problem
10 people shared problem details
water running back into the car on both sides after it do i fix?
2001 Audi A8 Quattro121,000
Plenum fills with water when it rains, leaks into AC vent work all the way into rear compartment. Also spills onto floor of front seats.
Water is leaking into the footwells,and a gurgling noise is coming from inside of the car .Sprinkles of water comes from a/c vents, when a/c is turned on. Also Battery light is coming on and the battery and alternator have been tested ,and they are both good.Moisture is believed to have gotten into the dash.The indicator,which lets you know how much gas is left,and when the car is put in drive,blinked out for about a month.All of a sudden ,it came back on,and that was when the battery light appeared.
1997 Audi A8 Quattro160,000
Rainwater leaks in during heavy storms or Touchfree Carwashes. Water leaks in through HVAC System and comes through backseat AC vents IN WAVES.
ac condensation filled the front foot well.
Water draining on my foot.
I don.t know if its rain water or not but I have water leaking into the compartment and into the A/C/heating ducts also into the engine near the bottom of the windshield. What could possibly be causimg this problem?
2006 Audi A8 Quattro177,000
Water leaks in through footwell vents front seat of car in floor
You can simply blow it out with compressed air, it drains under your car too
I just washed my car, tried to get all the leaf from the windshield and i got water in plenum tray which was full of leafs and all the water stayed in it, due to the plugged drain. According to my mechanic which is employed by Audi dealer for 15 years told me, to fix the problem will cost me lot of money! Luckally there is a site "" and i got used module for only 200$ and he was able to fix my car for 450$ total! From now on i will clean my plenum tray every month regular to avoid the problem!
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