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.
Car Problem Reports
Volkswagen Passat Rainwater May Accumulate in Plenum Tray Due to Clogged Drains
Volkswagen Passat Problem
Average Mileage: 92,000 mi (35,000 mi - 150,000 mi)
Visitor, 1999 Volkswagen Passat, 35,000 mi
I clean the plenum tray and surrounding area monthly with my leaf blower.
Water leaking into interior, front passenger side.
Visitor, 2004 Volkswagen Passat, 90,000 mi
Large amounts of water on drivers side floor.
Cleaned out drain in driver door hinge, no longer seems to be a problem.
Visitor, 2001 Volkswagen Passat, 55,000 mi
water leaked into the passenger part of the front seat. this was due to the gaskets around the smog filter behind the glove box. I complained to the factory and they fixed it under warranty even though the warranty had expired. There is a trnasmission control module under the passenger seat. The water seeped into it causing the car to lock into second gear. estimated cost of repair was 1000 dollars. The factory fixed it
it for which I was thankful.
Sudden lost of brakes. The service tech stated the cause was a power boost failure in the braking system. No debris visible,