I work at a Volkswagen dealership and I'm not wanting to get a tech to charge me 3-3.5 hours to change my fan resistor and I'm not convinced that's the problem. Since they're not used to working on these cars, I don't want to play the guessing game on their clock. Would I be able to do it myself? Do I have to go into service mode? What is a feasible time frame to do this? I also noticed that the small connector for the high speed fan is not plugged into anything. Logic tells me it should be. Is that correct?