Welcome aboard. NONE of the single guys crawled over this post?? Sheeesh, they're slipping.....
The fan would seem noisy at high speed, true.
If the fan module fails, usually the problem is NO fan operation, not high speed. We'll have to trust the technician is correct, BUT if it does the same thing after replacing it, make sure he doesn't bill you for the part! Are you sure the fan was running fast, which is why it was noisy? Or was it just possibly caused by the fan not being operated for potentially 1 year or so? But I agree, a auxillary fan operating at high speed=airplane-ish sorta noises. Also the higher fan speeds are typically called upon by high engine temps, not by the A/C system, but again you/me/we are at the mercy of the diagnosing technician now. Yes, it seems odd that the fan decided to act up after the AC panel was replaced. But if the old panel never called for the aux fan to run, and now it is operating properly and switching on the fans, but the controller is messed up (high speed only), sure maybe you never noticed it. I'd go with it for now, see what develops next. Now don't get to cozy with all these single guys at this site. Sharks, sharks I tell you, to the last man!
Gilly