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Your ac fan switch only works on 4th speed whats wrong?

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The thermal fuse in the blower motor resistor pack has blown. This is a very common occurrence on this car. A replacement resistor pack costs about $18.

It is fairly easy to replace if you have mechanical experience. Search the web for "blower motor resistor replacement sebring 1999" and you'll find lot's of explanations of how to swap it out. One caution> DO remove the pack by taking out the two 8mm screws, THEN disconnect the connector. Trying to disconnect the connector while the pack is still in position will drive you nuts.

Spray the inside of the connector with silicone spray (from your parts store where you get the resistor pack, about $3 for a can) before putting the connector back together (don't get it on the resistor coils). This will make the connector slide together much easier.
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