Hello, i own a 2006 Armada LE. The A/C system in this vehicle has a drivers side temp knob, a power/speed knob in the middle and a passenger temp knob on the right. When i turn the A/C power/speed knob to the right one time, it sould power on the A/C at the lowest level. Yesterday i turned the power knob once to the right to turn it on and it turned on however it went to the highest blowing level. If i turn the knob to the right 1 2 or 3 times i can see the light bar indicator increasing as it should when you increase the speed, however it stays on high speed the entire time. I can turn it 4 times to the left and then the A/C tuns off. If i turn in 1 time to the right again, it goes directly to high speed again. Soooooo its either off or High. I can not select a desired speed. Could the A/C power/ speed knob be damaged? Is there some type of relay i can check? Can anyone help me with this?