MY 2000 VW JETTA FANS KEEP RUNNING UNTIL MY BATTERY IS DRAINED. on 2000 Volkswagen Jetta

IF I TAKE THE BATTERY WIRE NEG OR POS OFF THE FANS SHUT OFF UNTIL I SWITCH THE KEY ON ACC THEN THE FANS COME ON AND STAY ON UNTIL I DISCONNECT THE BATTERY AGAIN, ALSO WHEN I CONNECT THE TERNMINAL BACK ON THE BATTERY IT HAS A LITTLE SPARK LIKE SOMETHING IS STILL ON. ONE MORE THING THE AC CLUTCH STOP WORKING ON THE COMPRESSOR. A MECHANIC HOOK UP A WIRE TO SEE IT THE CLUTCH IS WORK AND IT IS WORKING BUT IT DOESN'T COME ON WHEN THE AC BUTTON IS PUSH ON FROM THE CAR ITSELF. IS THERE A RELAY OR SWITCH FOR BOTH OF THESE PROBLEMS?

by in Brooklyn, NY on August 03, 2012
2 answers
ANSWER by on May 10, 2014
having the same problem , any idea what this might be? i brought new battery and alternator thimking this was the problem.
ANSWER by on April 10, 2015
It is most likely the fan control unit. I 99% certain that's your issue. The VW OE part # 3A0919506. As it is with Volkswagen's in general, they have an over complicated electrical system and this is also the same for the electrical setup on their radiator fan. Most cars have a simple relay switch that initiates the fan when the coolant reaches a certain temperature, but in VW fashion they have to over complicate matters and add additional electronics? The other possibility is the Aux. Fan switch OE part # 1J0 959 481 A. The switches you can find online as chap as $15. The fan control unit on the other hand are about $200