First problem sounds the temperature isn't registering so the car isn't putting enough water on the engine to cool it down. That's a pretty serious problem I would take it to a mechanic. Don't wanna burn up your engine if it is failing. A/c may need more free on (however you spell it) which is why it isnt getting cold.
"Hp sells cars, Tq wins races" - Carroll Shelby... RIP
2012 Mustang GT Convertible
2003 Mustang GT (Sold)
1999 35th Anniversary V6(SOLD)