You're not alone, I have the same problem with both headlight wipers on a '00 S40. As for "how" to change it -- well, look at it, figure how to get it out, replace, and put back in. Apart from being tedious, I don't think it's hard to do. Seems to be a common failure. On mine, I've removed the headlight wiper arms, the rubber on those wipers seems to barely last one season anyway so it's a money drain for nothing. Never had a need for the wipers...
volvo was not the first, it was Saab.
There is no button to operate the headlight wipers. The headlights washers and wipers are activated along with the windshield wipers when you use the windshield washer by pulling the wiper switch towards you.
They come on automatically whenever you apply windshield wash mode with the wiper switch. When doing so it also sprays wash fluid on the headlights. Just be sure if you live up north, clean the snow and ice off your headlights and wiper assembly so as not to freeze them to the headlights.
I assume you mean the angle of the headlights and not the brightness. On the headlights themselves are Allen screws with measurement markings and angle degrees. Loosen Allen screw and move bolt forward or backward to change angle.
http://volvospeed.com/Repair/sv40cabinfilter.php
Chilton or Haynes should have a repair manual for the Volvo S70.
The cost to change a timing belt on a Volvo S60 ranges from $500 to $750. It is an expensive repair in most instances due to timing consuming nature of the job.
Some car washes have brushes or flaps that can hit at headlight level and overpower the little wipers.
To fix windshield wipers on a Volvo 940 try using new wiper fluid and cleaning the windshield and wiper blades before you replace the blades. It is also important to replace wiper blades regularly.
how much will it cost to replace or repair rod for 1996 volvo 960?
after a while Volvo is pretty bad car with minor mechanical things get a new car
My advice know one cares freak