Last week blower motor wasn't working after a short stop. Bench tested the motor and it was fine. Replaced the blower resistor and it worked for a week.
While driving yesturday it shut off. I went straight to the parts store and swapped it out in the parking lot. It ran with the new resistor. Unplugged it and directly plugged in the old resistor and it ran and worked fine this AM.

Anyone ran into a similar issue?

 

I did when my blend door actuators were acting up. Long story short I had to have the BCM reflashed and that seems to have corrected the issues for all my HVAC stuff.

 

I've had the door actuator issues before. This is different. The blower motor itself shuts off. I guess it could be the dash switch.

 

It's the harness that connects to the blower motor. Look and see if your is not burnt or melted.

 

yep...the harness. you need to change the harness when replacing the resistor

 

The new resistor had the 2 wire harness going from it to the blower motor. The old one looked ok though. There is about a 6 wire harness going into the resistor. It looked OK from what I remember. I'll look a little closer though. Which harness are ya'll saying needs to be replaced?

 

The harness that plugs into the resistor, they melt and will cause problems like you're describing. I believe that the factory resistor comes with a new harness since it's so common and usually the case....or at least I thought that it did...

 

Ok, you guys were right. The 7 wire plug to the resistor melted. I feel like an idiot for overlooking it but not a common problem by any means. The black wire was pulled out of the plug a 1/4". Either bad connection caused the resistance or bad design. One thing I did differently that day was I ran it on high (5) the 30 min trip home. I normally basically never take it past (4) since it is plenty. It all makes sense.
The resistor was an AC delco that I bought from Advance Auto Parts but didn't come with the harness. So, you have to get the harness from the dealer I'd assume?

 

The dealer for sure, but there are other places...check out this thread, a little bit of drama, but some good info: https://www.performancetrucks.net/fo...d.php?t=463637

 

There is someone on ebay selling them for a good price. I just changed mine and it cost $175 for resistor and harness from dealer. I think the ebay price is like $80 or so.