The other day the a/c stopped blowing cold, befor that it was super cold. The truck is new to me so I don't know much about it, the temp sensor also stopped working I am not sure if its related, no overheating problems.

 

Is this all the time or when stopped?

First thing to check is if the fan is working; after that, make sure the condenser isn't clogged with mud or bugs. Next, I'd check for leaks.

 

It might be your expansion valve... How often does this happen, when (outside temp)?