I have a 2012 Tundra Crewmax Platinum and this summer I started noticing a high pitch whistling noise. This whistling noise happens at cruising speeds (between 45-57 MPH) with the AC on and with the air recirculation switch on. I’ve taken it to the dealer and they have concluded that it's tied to the air recirculation switch, as the noise disappears when this switch is off. The dealer’s had the truck for a day to see if there was a simple solution to fix this whistle and after a whole day of testing, they’ve come to the conclusion of replacing the heater box. Apparently this will involve a major strip down of the dash and crash bar in order to access the heater box. Questions...does anybody else have this issue in their Tundra trucks? And do you think the dealer mechanics are capable of putting everything back in place without creating any new dash rattles? I’m kind of apprehensive about this whole ordeal.