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On the Mercury like a lot of other cars, what happens is the relay for the fan control goes bad, somtimes you may just have low and high no medium but a lot of the time you just get high speed, thie is also very common on a lot of GM's. 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 cnnection. it is called a blow motor resistor it cost about 20 bucks from the dealer itis easy to install just one screw and a plug

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โˆ™ 2005-11-16 05:15:13
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Q: Why would a heater fan only work on high in a 1999 Mercury Mystique?
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