Front blower motor not working.

[Recon189]

Greetings, I have a 2004 Tahoe Z71 with a non working front blower motor. My son, which drives the vehicle, stated that the blower motor just stopped working while going down the road. I began checking it out by checking all fuses and relays. All appear fine. I then pulled the blower motor out of dash and determined there was power to the plug at the motor. I bench tested the blower and it worked fine. I have power from the switch to the blower resistor and from the resistor to the motor. Plugging the resistor back in, plugging the motor into the resistor but the motor fails to work. I did notice that the power to the resistor and to the motor are constantly hot, don't know if that is normal.

So now my question is could the resistor be bad even though it is allowing power to go to the blower motor? Oh, the power plug to the resistor is only a three wire plug and I don't know how to test the resistor.

Any help would be greatly appreciated as I'm stumped on why the motor isn't working if it is getting power to it.

Thanks in advance for any assistance.

 

[Doubeleive]

Greetings, I have a 2004 Tahoe Z71 with a non working front blower motor. My son, which drives the vehicle, stated that the blower motor just stopped working while going down the road. I began checking it out by checking all fuses and relays. All appear fine. I then pulled the blower motor out of dash and determined there was power to the plug at the motor. I bench tested the blower and it worked fine. I have power from the switch to the blower resistor and from the resistor to the motor. Plugging the resistor back in, plugging the motor into the resistor but the motor fails to work. I did notice that the power to the resistor and to the motor are constantly hot, don't know if that is normal.

So now my question is could the resistor be bad even though it is allowing power to go to the blower motor? Oh, the power plug to the resistor is only a three wire plug and I don't know how to test the resistor.

Any help would be greatly appreciated as I'm stumped on why the motor isn't working if it is getting power to it.

Thanks in advance for any assistance.

typically the resistor goes bad, its pretty common

 

[Recon189]

typically the resistor goes bad, its pretty common

Double level thanks for responding. If the resistor is bad will it still allow power to pass through it to the blower motor?

 

[Doubeleive]

Double level thanks for responding. If the resistor is bad will it still allow power to pass through it to the blower motor?

if there was enough power coming out of the resistor and the blower is known to be good then it would spin right?
the thing is it may show 12v but may only have .004 milliamp which would not be enough to spin the blower, the resistor will create heat which eventually just burns it's self out, this is why they generally have a heat sink on them so the blow-by air can cool the resistor but over time they eventually die anyway.

 

[Recon189]

if there was enough power coming out of the resistor and the blower is known to be good then it would spin right?
the thing is it may show 12v but may only have .004 milliamp which would not be enough to spin the blower, the resistor will create heat which eventually just burns it's self out, this is why they generally have a heat sink on them so the blow-by air can cool the resistor but over time they eventually die anyway.

I didn't use a multimeter I used a test light to check power on the plug. So I don't know how many volts is at the plug. I'll check it this weekend when I'm off and see what the voltage is.

Should the plug be hot even with the key off?

 

[HiHoeSilver]

I didn't use a multimeter I used a test light to check power on the plug. So I don't know how many volts is at the plug. I'll check it this weekend when I'm off and see what the voltage is.

Should the plug be hot even with the key off?

I know it seems weird. There's another thread from the past year somewhere with the same problem. Iirc, he tore the controls apart and everything. It was the resistor. Save your time and just change it. If it doesn't fix it (probably will), you've got a new, known good part.

 

[Recon189]

I know it seems weird. There's another thread from the past year somewhere with the same problem. Iirc, he tore the controls apart and everything. It was the resistor. Save your time and just change it. If it doesn't fix it (probably will), you've got a new, known good part.

That's probably what I'll do I just hate to spend $115.00 and that not be the problem.

Thanks for your help.

 

[HiHoeSilver]

That's probably what I'll do I just hate to spend $115.00 and that not be the problem.

Thanks for your help.

I'll spend a few minutes tonight looking for that other thread.

 

[Doubeleive]

That's probably what I'll do I just hate to spend $115.00 and that not be the problem.

Thanks for your help.

UGH NO, look on rockatuo there is 2 different acdelco, 1 is $30 and the other is $50, plus there is a 5% discount code in the vendor section, don't get taken by the stealer
https://www.rockauto.com/en/catalog...g,blower+motor+control+module+/+resistor,6557

 

[HiHoeSilver]

Not the one I was remembering, but may be of help. Seems this guy had a loose connection at the controls.

https://www.tahoeyukonforum.com/threads/blower-motor-not-working.88646/