Mon Jan 30, 2006 4:28 am
Not quite sure what you mean by sticking, but most wiper faults are caused by grease in the wiper gearbox becoming hardened with age, and affecting the electrical contacts in it. This causes problems on intermittant wiper settings and with parking.
Other faults affecting the wipers can be dry soldered joints in the "relay", as Smithy says (largest black relay in the fusebox), and a wear problem in the spindle of the motor itself on RH drive cars, because of the wiper motors position exposed to the elements under one of the grills in front of the windscreen. This causes general slopiness and reduced travel of the wiper arms, but doesn't usually stop them working.
To get at the wiper motor you need to remove the rubber strip against the bonnet at the back of the engine bay and unscrew four seven mm self tapping screws holding the big removable part of the bulkhead in.
Also need to remove the LH plastic grill in front of the windscreen by carefully levering it up at the front (three spring clips).
If you ever need to remove the dash for anything, it's not half as difficult a job as you would think! Especially the second time you do it.