What are wall wipers?

How do you change the battery on a 2002 Nissan Altima? What is the fuel to oil mixture for a Jonsered 450 chainsaw? How or where can you have new rear brake drums balanced to eliminate severe vibration at highway speeds after rear brake job on your 95 Caravan Wheel balance was verified correct with spin balance? How do you replace the blower motor on your Nissan Micra k12? Knock sensor location 1994 mark 8? Where is the crank sensor on a 92 Chevy Cavalier 4-cylinder 2.2L? How do you replace the fuel filter located on a 1994 Toyota truck? Where is the transmission dipstick located on a 1990 Honda Prelude? What do over driving headlights mean? Does a 2007 corsa have a cable clutch or hydraulic clutch? What causes a squeak in the front end? How do you reset the service engine soon light on a 1991 gmc sierra with a 350cubic inch motor? What is the problem when your 2002 Pontiac prix make a whistling noise when steering wheel will not turn? Where is a Mass air flow sensor on 1992 Cadillac Fleetwood? What type of coolant should you use in a 2005 Chrysler 300C? Does a 2014 and 2015 Ford Fusion have a time chain or a timing belt? Is the exhaust valve smaller or bigger than the intake valve? Why doesn't the check engine light go out after you replced the 02 sensor and reset the light? Does a 2003 Jeep Liberty v6 have a timing chain or timing belt? Why middle men should not be eliminated in the chain of distribution?