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Does anyone know where the rheostat for the A/C blower motor is on a C4? Is it on the firewall by the air box, or is it inside the car somewhere?

Need to know since my blower motor has decided to only work on the high setting which bypasses the rheostat according to my wiring diagram.
 

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Your heater - A/C fan resistor is located under the hood on the passenger side. Follow the ac lines into the heater box attached to the fire wall and it is located on top of the box. Should be held in with two 7mm screws and have a light blue, dark blue, tan and yellow wires connecting to it.
 
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