Hi all:

I have a 1999 C2 Cab with 33k miles. I have a strange buzzing noise coming from the passenger side dash when the a/c is on and I stop at a light or stop sign. When I give it any throttle, it goes away, but then starts buzzing again at idle. It goes away completely when I turn the a/c off. It seems to be coming from the general location of the speaker on the dash, but is not a result of the radio - it is definitely somehow related to the a/c. I've had it looked at by a dealer, who consulted with Porsche NA techs, and they thought it was fixed, but I still have the same problem, and it's very annoying when it's 100 degrees and I need to run the a/c.

I'd appreciate any insights, as the car is certified and I'd like to get it taken care of in one visit, instead of having to return to the dealer multiple times.

Thanks in advance,

Todd