Unusual Air and Noise from Bath Sink - AC primary drain
This is the other thread referred to earlier.
The thought being the drain line on the A/C is not trapped and vented properly and is forcing air into or out of the condensate line under pressure of the blower.
Gunter's thought seems to be similar except with the outdoor wind pressure difference causing air to gurgle past the plumbing trap(s) only during high wind events.
Other thoughts, could be a blocked vent that lets a trap get sucked nearly dry... try tracking the noise to the particular trap and isolating the times that it happens (i.e. only when the wind blows out of the south over 10mph, anytime the a/c runs, etc.)
90% of fixing a problems is isolating the symptoms so that it can be reproduced or at least explained to the plumber, tech in enough detail for them to have a clue about what is going on.