Fuse Blows when fan turned to Hi speed

CHEVROLET SILVERADO
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FSTRICKLAND
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  • 6 POSTS
1981 Silverado, 193K + miles, 350 motor, 2wd. The fuse for the blower motor blows each time the speed is switched to Hi, it works in the other positions(speeds) with no problems. I have replaced the blower motor, the fan switch and the blower motor resistor. I have also made sire the plug for the switch is not melted. Is there anything else to check? Thanks for your help.
Mar 11, 2007 at 7:58 AM
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CHEVY22
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one quick question , does this happen in defrost , ac or any mode

Jim
Mar 11, 2007 at 10:34 AM
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FSTRICKLAND
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Any mode.
Thanks.
Mar 12, 2007 at 10:54 AM
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CHEVY22
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i cant find a diagram that old but i have one for 83 , if they are the same there is an ac resistor and relay under the hood , have you looked at those yet

Jim
Mar 12, 2007 at 11:07 AM
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FSTRICKLAND
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Not familiar with the relay, but I have also changed the resistor and the heavy gauge orange wirethat plugs into the resistor.
Mar 13, 2007 at 2:53 PM
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CHEVY22
  • ✓Experienced Mechanic
  • 1,375 POSTS
the ac relay and resistor should be under the hood on the right side of the firewall chek those out too

jim
Mar 13, 2007 at 3:14 PM
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