The a/c only blows on high

1996 CHEVROLET CAPRICE
118,000 MILES
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PRUDENTIAL_1837
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I have a 1996 Chevy caprice 4.3 V8. I tried replacing the blower motor control switch(didn't work). What else could it be.

What could it be
Nov 18, 2011 at 9:52 PM
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FIXITMR
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what about blower motor resistor unit? it is responsible for speed differences.
Nov 18, 2011 at 10:06 PM