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Blower Motor

Powers

By Powers
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Powers

Posted
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I drive a 2007 Chevrolet Silverado classic 4x4, when turning off my truck my blower motor continues to run. I was told this was my blower motor resistor and to change it, in changing this I pulled the old one out and to put the new one, I had to cut the wires to install the new part as soon as I went to cut wires they smoked on me, this scared me cause there was still power running to the plug. Is this common? Could this still be the blower motor resistor or a deeper problem?

Jsdirt Senior Enthusiast

Jsdirt

Posted
Posted

Shouldn't be any power going to the motor when the key is off. Could more than likely be the crap wire they use these days. We have more of it than ever, yet, it's the weakest, flimsiest crap I've ever seen before. Could be a faulty ignition switch too - many possibilities. Some testing is in order.

 

Once you get that sorted out, you'll have to replace a fuse or 2, since the smoke was let out of the wire there.

kstruckcountry Senior Enthusiast

kstruckcountry

Posted
Posted

The motor running when the key is off is a pretty common sign of a bad blower motor resistor. Generally, you want to unhook the battery when doing any electrical work. I would complete the replacement and see if it fixes the issue, if not there's definitely more going on.

 

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Doug_Scott Senior Enthusiast

Doug_Scott

Posted
Posted

Logic says that if the motor was running with the key off then there MUST be power on one of the wires. Don't know if there should be power on one of the wires or not, but I do know that cutting multiple wires in one cut is a no-no. You are only asking for trouble when you do that, especially with the battery still connected. This likely only took out a fuse or two, but could have just as easily caused a lot of expensive damage if it were a different circuit. I agree with the above post, disconnect the neg post of battery and continue repair. See if the problem is fixed now. You may need to replace some fuses as well..

tbarn Senior Enthusiast

tbarn

Posted
Posted

Yes. 12v to the blower resistor with key off. Usually via 40a fuse in under hood fuse box.

Jsdirt Senior Enthusiast

Jsdirt

Posted
Posted

Odd design ...

Doug_Scott Senior Enthusiast

Doug_Scott

Posted
Posted

Odd design ...

 

Perhaps it was done that way to allow remote start to run the fan? Maybe an easier/cheaper way to do it.

Jsdirt Senior Enthusiast

Jsdirt

Posted
Posted

Ahh, didn't think of that. Makes sense.

 

Would think they'd be concerned with a fire hazard, but I suppose that's what the fuse is for.

GasHog369 Senior Enthusiast

GasHog369

Posted
Posted

Same thing happened to me in my old 2006.., cut the wires. It grounded out since you are cutting thru the ground and positive at once. When the cutter contacts both it creates a connection. Likely blowing a fuse. Mine did.

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