My small fan (V177) starts around 92C with (V7) kicking in around 103 with A/C off. With A/C on V7 is on full time I think somewhere below 35 mph no way to know for sure. I don't know about the resistor issue, I do know if the fan motor is open circuit it's toast, verified on my V7. Does the small fan run with A/C on? With everything you've swapped out I'm thinking maybe wiring. I'd get a vag scan.