Hey guys,

I'm getting this random buzzing sound on my '69 442 from behind the temp controls. It only happens after the car's warm and I've been driving it a while. Usually when I hit a bump in the road.

The buzzing goes away if I put pressure on the heater controls with my finger.

I've tried tightening the screws behind the heater controls and even went as far as tie wrapping and taping wires that I thought might be vibrating off the rear of the unit but nothing has helped. And since this only happens after I've been driving the car for a while it's not something that I can road test to hear immediate results. I won't know until at least 20 minutes into my next drive.

Any help is really appreciated.