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Old 06-21-2015, 08:40 AM   #1
Joesjunk
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Join Date: May 2001
Location: Independence MO.
Posts: 7,705
Question about blower motor going to high only when AC is on?

I have a '75 Silverado and when you turn the AC on the blower motor automatically goes to high speed and you can't switch it to any other speed. But the fan speed adjusts normal on all other setting, like vent, heat, and defrost. No matter where the fan switch is when you move the lever to AC, the fan goes to high speed. Any ideas on what's wrong? Thanks
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