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The sliders are electric switches so there is very little resistance to move them. Therre are two electric motor actuators under the dash that move the internal flaps for defrost and heat adjustments. Sometimes the motors go bad.
For the temperature of the air there is the rotary switch and the heater control valve which is in the 3/4" diameter heater core coolant line near the firewall or near the distributor. It is vacuum controlled. (google 944 heater control valve for a picture)
There is a very complicated electronic gizzmo (climate control module) that controls all of this that could also be bad.
Look in the drivers footwell and you cna watch to see if the blend door lever moves when the slider is moved.
look in the engine compartment to see if the heater control valve moves when the knob is turned.
Have you looked at Clarkes, there is a good write-up there about all of this.
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