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check the blower motor for power and ground at the motor. if this is good hit the blower, if it starts or tries to start replace the blower motor. if you have no power at the motor check the resistor for power going in and a good ground. if you have these going in and not coming out then the resistor is bad. this is a common problem with just about all cars.
you know those little brown lines on the inside of your rear window, they are wires and can get damaged when cleaning your window. get an OHMS meter and you can actually test the lines on your glass and find the damaged sectors, you can get repair kits to do repairs
If ur demister is broken(line on the mirror is all broken up), there is REPAiR KiT that u could buy in any parts and accessories supply store. Its a LiQUiD electric conduit that u could just BRUSH it like paint!
EASY FIX HAD SAME PROBLEM WITH MY AUDI A4 2002 JUST LAST WEEK.....WILL BE ONE OF THE CONTROL MOTORS FOR AIR FLOW...UNSCREW THE 4 OR 5 SCREWS THAT HOLD THE GLOVEBOX IN PLACE TAKE CARE TO UNPLUG GLOVEBOX LIGHT WHEN LIFTING OUT...NOW YOU WILL SEE ALL THE CONTROL MOTORS RIGHT-HAND SIDE OF YOU...EACH ONE CHANGES THE AIR FLOW ...THE ONE FOR THE WINDSCREEN IS THE ONE NEAREST TO THE FRONT OF THE CAR..UNPLUG THE WIRING CONNECTOR UNDO THE 2 SCREWS NOTING HOW THE MOTOR SHAFT ENGAGES...EASY....IF YOUR UNSURE WHICH CONTROL MOTOR IT IS TURN ON YOUR BLOWERS AND TEST EACH ONE..SIDE VENTS, DEMISTER,ETC...TRY AND GET A SECONDHAND CONTROL MOTOR FROM SCRAP YARD...DEALERSHIP PRICES JUST A JOKE.. FOR A CHEAP TINY MOTOR NOT MUCH BIGGER THAN A MATCH BOX OVER A £100 SCRAP YARD £5 POUNDS...........HOPE THIS WILL BE OF SOME HELP TO YOU...
Do you have rear window tinting?( the plastic sheet type ) If so,check that the edges over the demister tapes have not curled up pulling the tapes off the window and diconnecting them. If they need repair, a small bottle of tape repair solution should be available from a spare parts retailer. El Nombre