Ford F85Z-19C733-AA Potentiometer Assembly

Before removing the radio and controls, pull out the A/C Switch from your instrument panel by first taking out the screws that keep it in place and removing the trim. When the automatic temperature control system comes as an option, its control unit will include a separate microprocessor. Some cars include extra controls either in the dashboard or steering wheel. The EATC system can check its own problems. To work on the control assembly, remove it from the instrument panel first. Then disconnect each electrical connector and vacuum line gently by lifting up the plastic clips and detaching them with care. Avoid breaking the plastic connectors to prevent vacuum leaks. Tear off three plastic grips in the back of the control panel to take out the speed switch, function selector, and blend-control switch. As you pull them forward, their front knobs stay attached. The car's optional rear heating/air-conditioning package has two control panels: one up front where the driver controls the front climate, and another behind for the rear passenger compartment with cool air or heat only. You follow the same steps to install the switches as you did for taking them off.

Disconnect the cable from the negative battery terminal. Remove the instrument panel center bezel. Disconnect the connectors from the back of the A/C Switch and the other connectors to allow for the complete removal of the bezel from the vehicle. Remove the A/C Switch retaining screws and take it out from the center bezel. Installation is the reverse of removal, and reconnect the battery.