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The Volvo "sound traps", which are rubber drain tubes with a crimped end that passes through the firewall into the plenum chamber, get blocked with muck.- Remove the a-pillar trim by pulling outwards from the top after pulling back the rubber door seal. Slide the retaining strap up to release the trim piece. Don't cut it as it's there to stop the trim flying into your face if the curtain airbag deploys.- Pull the drain hose out of the black rubber sound trap at the bottom of the windscreen- Using needle nosed pliers pull the sound trap out of the dash (will require some pulling)- Once out of the car clean out the rubber sound trap and cut 2-3mm off the crimped end that sits in the plenum chamber- Refit by spraying PTFE/graphite lube onto the bit that goes through the firewall and poking into place with long fingers (this bit's very fiddly).- Test that the drain runs freely by slowly pouring water down the affected drain with the sunroof open. The water should drain just inside the front wheel arches.Once done you shouldn't have the problem again.
put some water down the hose, take some compressed shop air and blow out the tube to try to free the clog.
The sound trap is just a small rubber tube, pinched on one end. It is located where the hose exits the interior cabin area.
you should be able to access them with the a pillar trim removed
You can cut the rubber where it is pinched together, to get better drainage.
they are in the a pillar behind the trim panel.
Then you need to remove the cowl. Pull the wiper arms, there are only a few clips holding the cowl into place.
Just follow where the tube exits the interior, they are going to be very close to the windshield.