The AC fan only comes on when the Temp. Control Dial is set to it's lowest set point at 60 degrees, and the Fan control dial will only work at it's highest speed. The air that does come out at these highest fan speeds is not cold. Is there a resistor that controls the fan speed switches, or maybe a relay?
Usually when the blower fan only operates on hi speed, its because of a failed blower motor resistor. You still have hi speed because on hi, the power going to the blower motor goes directly to it, as opposed to the lower speeds, when the power is routed through the resistor, thus lowering the voltage, which in turn lowers the speed of the fan. The resistor is usually located near the blower motor itself, under the hood back near the firewall.
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