Check heatertreater.net for diagnostic information and a fix for the blend door/actuator problems endemic to this model.
how hard is it to replace the blending door
heater door actuator for Ford Explorer.
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My 2004 ford explorer there isn't any vacum from the present heater control valve and the blower has been replace and the themostat has been replace and there is a clicking behind the a/c unit
The heater matrix can be replaced by removing the heater core and temperature control cables. Replace the heater core and the control cables.
The temperature actuator motor controls the flow of air through the heater core. The motor is located under the driver's side dash, above the transmission tunnel. It's a little difficult to get to, but not bad. Check heatertreater.net for pictures and what to check for on the actuator motor.
Unfortunately the entire dash must come out to replace that unit.
specs on how to replace a heatercore on a 1993 ford explorer
the heater control has a thermostat for the heater only. that thermostat needs replacing
the temperature control actuator is on top of the heater box under the dash. you have to remove the dash to get at it. a repair manuual will show what screws to remove
You can replace the balls in the heater control panel on an XS ARA Picasso by removing the front cover of the heater control panel. The panel lights will then be visible.
Remove the heater control valve and replace it.