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Here are some answers from my 99...it may be the same problem...

There is a resistor pack located on the heater core housing just below the glove box. When this goes bad, the fan will only function on high. It's an easy repair. Just one screw and an electrical connection...it is called a blow motor resistor it cost about 20 bucks from the dealer it is easy to install just one screw and a plug

These are from other contributors so they deserve the credit if it helps...I haven't tried the fix on mine yet...

Please show exact location for blow motor resistor

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Q: Why would heater fan only work on low speed in a 1996 mercury mystique?
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