Ac wont charge and dont work why?

Thermostats and temperature sensors do not generally influence air conditioning operation. Taking a can of R134a to the lines is a terrible idea for your car, your wallet and the environment. You need professional assistance. I'm sorry to say, you can't just guess and damage the environment by trying to add refrigerant when there is either a full system or a leak that makes you irresponsible for venting to the environment. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops