* Make sure heater is turned off completely (turn knob fully clockwise)
* Underneath the car, unhook the two cables at the heater boxes (little barrel clamps at heater box flaps)
* Unscrew the knurled nut below the heater knob
* Pull out the knob assy - the two cables should trail right along
* Remove the little pin at the bottom of the knob assy to remove/install cables
* Remove old cable and install new cable - replace pin
* Note - one cable is longer - the Bently says the longer one goes on the passenger side.. I disagree - It stands to reason the longer one goes on the drivers side.
*Feed the wires down the tubes
* Note. the screw jack assy (below Knob) has a slot - this slot has to go back onto the little boss down inside the control shaft - if you miss it - it will not work properly
* Retighten the knurled knob nut
* Hook up heat boxes.
Hope this helps! 