So, I've got an 07 dc sr5. The heat and a.c. both work fine, except for the fact that when you turn the knob to blow on the floor, it blows everywhere but the floor. Any other position and it works as it should, but when you turn it to the floor it blows everywhere else. What should i check to get this figured out. Having it on the defrost or face dries my contacts out and drives me nuts lol. any help would be appreciated. Thanks!