Sleeper 12 volt outlet

Often it's because the female side is dirty inside.
I can't really remember on a Columbia but you need to pull out your glove box ( 4 screws) and take of the cover of the panel.
If I'm mistaken look for a button between the air vents push it in an lift up that section of the dash to get to the panel.
It one these options.

 

It might not be labeled as cig it might be labeled as sleeper power or something else.
If you've got something to plug into it you might have to just pulling out fuses one by one till you find it.
By the way what are you plugging in that's getting hot, just curious?

Ya know there's another fuse block under your hood on the firewall next to your steering shaft but, that one generally only houses trailer lights and abs fuses and such.
Also you can always just call a freightliner shop and ask.

 

Yup, that'll cause the burning....lol

 

Lmao!!!!
Ya when I typed that I just started lol , funny thing is I wasn't even going for that.

 

So what is it that your plugging in that one.?
Years ago I use to use one of those Burton 12v coffee pots. Well Ya have to get up 15mins early to turn it on cause that's how long it takes to spit out 1 cup of coffee
. One morning I plugged it in hit the snooze button then woke up to find the plug literally melted into the scocket.