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Fuse Blows when fan turned to speed

Tiny
FSTRICKLAND
  • MEMBER
  • CHEVROLET SILVERADO
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.
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Sunday, March 11th, 2007 AT 2:58 PM

5 Replies

Tiny
CHEVY22
  • MECHANIC
  • 1,375 POSTS
One quick question, does this happen in defrost, ac or any mode

Jim
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Sunday, March 11th, 2007 AT 5:34 PM
Tiny
FSTRICKLAND
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  • 6 POSTS
Any mode.
Thanks.
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Monday, March 12th, 2007 AT 5:54 PM
Tiny
CHEVY22
  • MECHANIC
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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
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Monday, March 12th, 2007 AT 6:07 PM
Tiny
FSTRICKLAND
  • MEMBER
  • 6 POSTS
Not familiar with the relay, but I have also changed the resistor and the heavy gauge orange wirethat plugs into the resistor.
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Tuesday, March 13th, 2007 AT 9:53 PM
Tiny
CHEVY22
  • MECHANIC
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The ac relay and resistor should be under the hood on the right side of the firewall chek those out too

jim
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Tuesday, March 13th, 2007 AT 10:14 PM

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