My 2006.5 Jetta TDI (1.9L BRM) does something strange with the AC. The car is a 5-spd manual, and I notice something odd when driving the car in reverse. Shifting into reverse does nothing, but when DRIVING in reverse over even just a few MPH, the AC begins to blow probably 2x the volume! Stopping or shifting into any drive gear causes AC to blow normally again. This is so confusing, has anyone notice this quirk?