on my 1986 244GL was very frustrating. Finally I had to pull the motor, and there it was! A hole rusted clear through the hidden side of the motor housing, and who-knows-what banging around inside there ruined it.

Replaced with a part from a junker, and the most expensive stuff was the rope caulk from NAPA. Like around $13 for a 20-year (for me) supply. But that's what my friend at the Volvo dealer parts counter said their techs use.

If you do replace the motor, take the opportunity to use a vacuum crevice tool and a long wire to extract as much stuff as possible from the air channel. You can get in there through the hole the wiper motor shaft housing fits through.

Good Luck,

Bob

:>)