I recently had the vents on my 240 wagon start acting up. Now the floor vents are always open with the button in the out position and i here the vacuum suction or maybe depletion. however, i push it in and the vent has less output but then the sucking or depletion sound goes away. I had my mechanic look at it and he fixed all vacuum leaks at the console and in the engine. I didn't think it was pertainant at the time so i bailed on trying to get that fixed. Does anyone have this problem. ?

thanks,
victor