lift the bonnet and check the plastic scuttle tray for any cracks. the cracks will let water drip onto the motor for starters.
to get the motor out you unscrew the passenger dash tray. remove the foam material stuff and the whole motor should twist out with the housing. Cant remember what way it twists out

you can take the motor out of its housing by pushing in the three rubber clips and the motor pulls out. clean up the two bushes with electircal contact cleaner and grease it up if needed.
that should sort it
