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HVAC Control Problem


91GranSport
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I have an HVAC control problem. It isn't that serious but I'd like to know what is causing it and how to fix it. I have a '91 Regal GS with dual zone climate control. Anyways, everything works except for the fan speed switch. As you may recall, my fan speed switch only has a low, med, fast and max setting. Well, low, med and fast do not work. If I switch to any of those settings the fan does not turn on. Only the max setting works. The max setting works well as it normally would but all other speeds shut the fan off completely. Any thoughts? Thanks.

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This is related to the resistor board that controls the fan speed. Each selector (lo, med, etc) sends the current that powers the motor through one or more resistors located near the motor. High sends 100% current to the motor...ill explain more in detail once I get some sleep....later

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