The Heater box is on the right side. It has one bolt on the left side of the housing where it attaches to the a/c box. It then has one hanger rod which you can see if you open the small fresh air door on the right and look in. The shell half that you need to remove has those real tough clips to hold the halves together. If you do not take the time to pry them off properly, you will break the lip of the heater half and then you are screwed. I broke mine and the only fix was to use silicone and clamps to get the halves back together. Hopefully I will never have to remove it again...