Car Problem Reports

Audi A8 Quattro Rainwater May Accumulate in Plenum Tray Due to Clogged Drains

Audi A8 Quattro Problem
24 Reports
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Model Years Affected: 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2008

Average Mileage: 97,000 mi (55,000 mi - 160,000 mi)


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.

  • water running back into the car on both sides after it do i fix?

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  • , , 121,000 mi

    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.

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  • , , 78,000 mi

    ac condensation filled the front foot well.

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  • , , 82,000 mi

    Water draining on my foot.

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  •  Rookie

    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.

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  • , , 160,000 mi

    Rainwater leaks in during heavy storms or Touchfree Carwashes. Water leaks in through HVAC System and comes through backseat AC vents IN WAVES.

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  •  Rookie

    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?

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  • , , 80,000 mi

    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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