blower motor

[lookdownrange]

This issue started when My blower fan on the front ran on high all night and drained the battery. I read that this was usually fixed by replacing the relay which I did. While I was waiting for the relay from Napa I removed the blower and checked it's condition and noted it turned a bit hard so I also replaced the blower motor as well. Now After installing these parts nothing works. I have checked the fuses and everything I can think of and all looks good. Any advice would be appreciated. I am stumped at this point. My Yukon XL is a 2001. I almost forgot to say hello as I am a new member to this forum. Thank you for any help I can get. Greg

 

[Fless]

Welcome to TYF. You can use the Introduction forum to, well, introduce yourself.

Have all the HVAC fuses been checked? There is one in the underhood fusebox (two, actually, one for front and one for rear HVAC) and one in the instrument panel fuse block?

 

[YukonRog]

Many times the connector to the fan relay is bad. And sometimes the wires that's connected to. Unplug it and look to see if the small pin connectors are all clean and straight. Same for the resistor side where they connect.

 

[OR VietVet]

I recently did this replacement on my 05 and did find connection problems that had not caused a failure yet but would have soon.

Welcome to the forum.

 

[Fless]

When you say "relay" do you mean the blower motor resistor by the blower motor, up above the passenger footwell? Or something else?

 

[OR VietVet]

When you say "relay" do you mean the blower motor resistor by the blower motor, up above the passenger footwell?

Good call, I just assumed that it is the resistor which is a known problem area.

 

[lookdownrange]

Welcome to TYF. You can use the Introduction forum to, well, introduce yourself.

Have all the HVAC fuses been checked? There is one in the underhood fusebox (two, actually, one for front and one for rear HVAC) and one in the instrument panel fuse block?

 

[lookdownrange]

I didn't know there was a panel fuse block. I will check that. Thank you.

 

[lookdownrange]

Good call, I just assumed that it is the resistor which is a known problem area.

View attachment 357311

View attachment 357312

 

[lookdownrange]

Yes the resister.

 

[Joseph Garcia]

Welcome to the Forum from NH.

Lots of knowledgeable folks here who freely share their knowledge, experiences, and perspectives. Knowledge is power.

I hope that you will become a participating member in the Forum's discussions.

Pics of the truck, please.

You are already receiving sage advice from the knowledgeable folks on this Forum.

 

[lookdownrange]

I have now checked all fuses. all are good. I am really stumped. I will check all connections. That's the only thing left to do . Thanks for all the input.

 

[Fless]

Verify that you have 12v at the input to the resistor. Depending on the resistor, there may be two 12v inputs; one for HI and the other to go through the resistors for speed control.

Wells does a great job of explaining how it works, and some tests you can do:

HINT: at about 4:45 or so he tells how to get the resistor diagram online; maybe that would help you do some testing at the resistor.

 

[lookdownrange]

Sorry not to get back to this. I figured out that the pins on the new (China) blower motor were so small that the plug made no contact. I gave them a bit of a twist and that got the blower running. Thank you all for the input. Greg