2018 F350 AC blower not workimg

[Smokin 6.0]

Was working fine yesterday and now all of a sudden I have no fan on any speed or setting.

 

[DEEZUZ]

Combined with your other issue I'd suspect you have rodents. Chewing on your soy based wiring.

Any chance of this? Mice, shrews, squirrels, etc in your area?

 

[DEEZUZ]

I've had more 2015-2023 trucks in here for chewed up wiring than I have in 16 years of any trucks older than those.

 

[Smokin 6.0]

It sure. I’m in Indiana and have only had it a month. Came from Florida

 

[Smokin 6.0]

Back to this I changed the pigtail for the blower with a new OEM ford. I checked voltage at the connector and have 12v. I got a new blower and same thing. Can someone explain what the 3rd signal wire does. I even changed the control buttons with a whole new panel I had laying around and same issue

 

[Smokin 6.0]

So it keeps working and then not. When it doesn’t work I can turn the fan speed all the way up and the fan will ramp up and down with the speed of the truck as wired as that sounds. Any ideas ?

 

[Smokin 6.0]

Back to this I took it to does and they said it was a blown fuse. Unlikely. Anyway it was replaced and worked for about 2 months now it’s back at it again. Checked all fuses and nothing is blown all relays work also. Taking it back to gird to look again. I checked the blower motor connector with a meter and I have 12v on 1 of the terminals but I’m not sure what that terminal is. When you plug it in it goes away. Unplug and it’s there. So I held my meter on it when I plugged in and it’s there until it makes connection with the blower motor ????

 

[Smokin 6.0]

Bump