Hi, wipers not working? was the screen frozen? in-turn your wipers frozen to the glass! that's the cause of one problem there is overload on the motor to the point that the fuse will blow. I am being condescending here but are your tyres pressures right? Your car should have P.S. check your handbook if Electric P.S. is will tell you which fuse. The arm that I think they where talking about may be the Stabiliser link arm attached to the Gearbox or a gear box Mount, this would knock especially on setting off, if this was a lower Drop arm / suspension arm, if the Garage was a decent garage they would have told you that this is a safety item that needs replacement ASAP.