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OPEN PASSENGER DOOR.LIE DOWN.U WILL FIND A COVER AND 3 PLASTIC SCREWS.UNSCREW THOSE LITTLE THINGS AND TAKE OUT THE COVER.U WILL FIND A RECTANGULAR PORT CLOSE TO THE FLOOR AND NEAR THE CENTER CONSOLE.IT HAS A SAFETY PLASTIC STOP.PREES AND SLIDE TOWARDS THE CONSOLE.BEWARE THE LEAFES!!!!GENTLY TAKE OUT THE POLLEN FILTER.REPLACE FILTER WITH ACTIVE ONE!!BUE THE ORIGINAL IF POSSIBLE IT IS A LITTLE EXPENSIVE BUT IT GETS THE JOB DONE PERFECTLY!!!!!LET ME KNOW IF U NEED ANYTHING ELSE!!
Try cleaning the pollen filter or renewing it ,where it is on this vehicle i have no idea sorry about this but here in spain?? most pollen filters are under the passenger side dash area ,or buy a new one and in the box is a diagram of where it is .
Audi A4 Part number: 4B0819439C. Filter element (dust and polen filter) with odor and harmful substances filltration. Placed on the right side of the car, (engine bonnet raised), under cover plate for water box (also for battery box), and under water deflector at the bottom of the windshield - right side for Left Hand Drive (LHD) vehicles:
For Right Hand Drive (RHD) cars the cabin air filter is placed on the left side!
all sunroofs have drain pipes, usualy 4, one on each corner, they usualy run down the A pillars at the front and poke out near the kick panals by the footwell. the rears often run down the C pillar to the vicinity of the boot.
open the sunroof up and carefully pour lots of water around the drain gulley of the sunroof, you should see it pissing out onto the floor at the front and rear on each side. make sure water goes down all 4 corners of the sunroof and check. Pipes can come of at the roof. also the drain grommets block up.
common problem on passats also is the pollen filter housing letting in water (under the scuttle panel beneath the bonnet. on left hand drives though, this fills the passenger side only (left). not sure on RHD which side pollen filter housing is on , but when they leak the water fills up inside the car on one side only, which can flow front or rear depending on car being parked up or down hill.
the seal between the pollen filter housing and the bulkhead often leak, if you press down on the plastic housing you may hear the seal squelching water. there was a recall on this, so it may have been done.
If the comparment under the panel (where the battery is) is filling with water, there is a drain grommet under the batter that also blocks up sometimes, causing it to fill up and flow in where it shouldnt.
Filter element (dust and polen filter) with odor and harmful substances filltration. Placed on the right side of the car, (engine bonnet raised), under cover plate for water box (also for battery box), and under water deflector at the bottom of the windshield - right side for Left Hand Drive (LHD) vehicles. See picture below: