95 chevy Z-71 K1500 ac/heater blower won't work

Any ideas as to why a ac/heater blower would quit...........a/c compressor is coming on but no blower function when you try to switch from low to high
blower..........feel cold air coming from the lower floor vent but upper vents won't blow...........worked fine yesterday morning, went to town later in the afternoon and no blower...........fuses check ok............MRT
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Might be the power connector to the blower. Located behind the Glove compartment, wraped in foam. Mine melted a few years ago, replaced with a molex connector from Ratshack.
Cheers

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