I turned on the defrost when the truck warmed up this morning (fan speed 3) and it came out normal for about two seconds then went to low power in its own zone (not defrost) if that makes any sense. I tried different speeds and different zones (feet, face) and nothing changed. After a second or two the fan sounded like behind the CD player (still set to defrost) anyone had this??
Ive had some funky things happen too! The weird noise u decribed from the fan, but its only doing it wen i first start the truck untill it warms up. Its been very cold here. And fan speed setting #1 has stopped working. It still blows out the correct vents when selected though.