Audi A4 Noise: Gurgling Sounds (Up to 01/99) (Solution)

Author: Michael II.

"While idling, a bubbling or gurgling sound can be heard in the front right area."


Cause:
A ventilation hose runs from the activated carbon filter container downwards to the vehicle floor and outside. The hose is routed in a bend where condensation accumulates. During operation, the intake of fresh air then causes the noises described.


Solution:
After removing the front right wheel arch liner, you can access the ventilation hose of the activated carbon filter housing. This hose runs from the bottom of the housing to the vehicle floor and then to the outside.
Where the hose bends upwards, a 3 mm hole should be drilled in the hose at its lowest point, allowing any water accumulation to drain downwards.
Please provide the German text you would like me to translate.
Bye.

Michael.