Hi!
​​​​​​I had to let my Mustang sitting for a couple of months due to health reasons... Now the a/c cools as fine as usual on the passenger side, though the driver side seems that is locked to the heating.... My ride is not dual zone so i literally have no idea about what is going on! I live in Brazil and today is 98! Is there any specific fuse for the heating alone? I know it wouldn't be a real fix but it would help meanwhile...

 

It could be a problem with the blend door in the dash I suppose - any clicking noises coming from the dash area?

"Boa sorte" - my wife grew up in Brazil, Sao Paulo.

 

It sounds like one of the four blend door actuators is stuck. There's one behind the instrument cluster on the driver's side, two behind the center console on the passenger side (visible if you drop the glove box), and a fourth below the heater box.
In your case the problem child is one of the two that are mounted behind the center console. They're awkward to reach but if you drop the hole box, you can just about get in there with a small ratchet wrench with 8mm hex socket and swivel.

 

Thanks a lot! I'll really look into it.

 

Really Thanks! I will do so! I just need to remove the center console? A ratchet and a 8 hex? Is there anyway I can turn off the heater alone?

 

No need to remove the center console. Just lower the glovebox to the floor and look up on the passenger side of the transmission tunnel. You'll see two actuators mounted there behind the center console. The lower one is easy to reach whereas the upper one is a PITA. Both will have electrical connectors that you'll need to disconnect after you've unbolted them.