Random heater changes

[Arlucian]

I haven't had this problem for a while, but didn't worry about it cause it only happens on the highway and i've only been doing city driving. But on my journey over here i noticed my heaters switched from whatever setting they were on to defroster when i started lugging (not really lugging just giving it a good bit more gas to get over a hill) then as soon as i crested the hill and eased off it switched back. Its not related to the angle of the truck for any reason, i let off the gas going up a hill on a lonely highway to confirm that, it came back to my regular setting. This is one of the stranger things i've had happen for sure.

 

[MagSport]

Look up wild vents. There's a thread around here that further explains this but it's a vacuum leak.
Edit: found the link http://www.ramforum.com/f64/wild_vents-1255/

 

[dodge dude94]

^This.

Ten thousand times this.

 

[Arlucian]

Ah thanks, i did a search but i can't say i tried putting in wild vents... Dafuq is that sheet?

 

[Arlucian]

Fixed it found one of my electrical tape vac fixes failed so i put some heat shrink over the two ends and fixed it that way, probably wont be able to test it for a while but i'm sure itll work. Thanks guys!