2. Remarkably, the A/C controls stopped working immediately after we installed a new head unit above it, in the dash. Like much of the interior, the plastic housing for the controls had become brittle, and as soon as we pressed the retainer clips to remove it, the clips snapped off the housing. This didn't affect the controls, but when we took a reciprocating saw to the inside of the dash to make room for the head unit, we fear the vibration damaged the control's hard-mounted circuit board. A quick call to CK Resto netted us a new set of controls that fit and worked perfectly. Note that when ordering this part to have your truck's VIN number handy, because there are several different versions of this part that have different-shaped electrical connections on the back.