the tech probly has no idea what hes talking about. I have never heard this noise in my 3. Ask for a different tech and if still no resolution go higher, ask for a service manager or the dealership manager, if they are also shi* holes call hummer or gm and tell them about the retarded technicians that destroying GMs business by turning away customers with their stupid service technicians.
Complain to everyone that will listen to you!
Good luck, the 3 is an awsome truck, the only thing that ticks most people off is little problems like this which can be easily fixed if the dealers actually have some competent technicians.
Once agains good luck and enjoy the truck!
