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Chances are that the blower resistor is blown. The resistor is located on the bottom of the blower, located in the passenger side footwell. If the problem is with the resistor them the blower will only work on high speed, other than that it might be a broken wire.

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Q: 1991 Mercury Capri XR2 4cyl 5 speed w air Blower motor tested and works fine Every fuse in the block is hot but no power to the blower switch?
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