Passenger side heat doesn't work...
 

Hey guys, I drove my car this morning, tried to put the defogger on, and realized that on the passenger side, it was blowing cold air, as though the dial was 60, I tried raising it up and down all the way, still keeps blowing cold!! My drivers side is hot when I raise the temp and cold when I drop it..
Any advice as where I should start to getting this resolved?? Thanks in advance

Looks like it might be the servos