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?
MY 2000 VW JETTA FANS KEEP RUNNING UNTIL MY BATTERY IS DRAINED. on 2000 Volkswagen Jetta
by NHERNAME in Brooklyn, NY on August 03, 2012
ANSWER by Rweber130 , 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
ANSWER by geno25 , May 10, 2014
having the same problem , any idea what this might be? i brought new battery and alternator thimking this was the problem.