Blower fan not turning on when truck is started

Hello again everybody. Sometimes when I start my Tundra, a 2018 with 15k miles, the blower will be turned up 2/3s of the way on the dial beforehand, but does not actually blow at all once the truck starts. As soon as I adjust the knob to a higher or lower setting, it starts blowing. What is going on here? Is my battery low or something?

 

Might be talking out my ass here, but newer vehicles (meaning 2000+) have semi intelligent heat/AC systems. They won't usually go blasting full bore until the vehicle is slightly warmed up and it can actually give you the temp you have selected. Keeps you from getting a blast of hot air when you AC is cranked, and vice versa.

 

On my 2015 I had to replace the blower motor about 7 months ago. Only had truck coming on a year now. I would turn a knob all the way and no air, motor stopped working...

 

Didnt matter whether my truck was just turned on or been running an hour, motor stopped working.

 

Right. If the motor dies, you gotta swap. The OP's is only doing it sometimes, so I was going for the glass half full option. It's totally possible that the motor is starting to go. Could also be a short somewhere. I just don't like to think about those things.

 

Was this a

Were you able to change this, or is it too complicated?

 

I took it to a discount tire, they do other repairs and just got it replaced there.

 

At first mine would go on and then not at all. Got it looked at and motor was replaced.

 

It should just be right up under the dash on the passenger side. I did it on my old Ram, and it's just a few screws and a wire connector. Tight working space, but totally doable for a DIY noob like me.

 

I just had my blower motor replaced yesterday after 76,725 miles, it still worked but made a noise I just told the dealer to replace it.

 

I should add, I use the truck, when not running, to run not 1 but 2 compressors to inflate anywhere from 5 to 15 paddleboards, twice a week at least, all summer long. So the battery does take a licking. I never charge it, just run the truck as normal. I wonder if voltage is lacking enough to run the blower, prior to the alternator cranking out juice(battery rundown protection or something). I should charge it...