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It is probably the resistor. I had the same problem with my 99 Cougar. It is located on the passenger side under dash. Check with Ford. I think that this part was recalled.

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โˆ™ 2007-10-26 19:17:10
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Q: If you replaced the blower motor switch resistor on a 1999 Mercury Cougar because the blower only worked on high speed and now you have no heat what could be the problem?
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