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2000 Chevy Silverado 1500 LS Having problem with wiring harness getting hot and sticking together and blowing the ecmb fuse

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If ecm is by battery..battery acid is eating up cover of wiring and shorting out

Posted on Sep 21, 2010

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Chevy silverado 1500 2003. For several months the fan has only worked on "5". Today, even when off it only blows high. I had to pull the fuse for the blower. Any ideas?


The blower resistor needs to be replaced, that is why your only have the highest setting working since the blower speed resistor's are being by past. The other thing that happened is since the blower is always on high, the high current most likely burnt out the blower relay and ir stuck in the close loop and needs to be replaced. pay attention to the wire harness, since it got hot enough to damage the relay, it may have damaged the wire harness to and fire may start due to a short. Good luck and hope this helps.

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