The most common cause of an AC system blowing warm air is a lack of refrigerant, though, you may also have a problem with your condenser. Other possibilities include a faulty compressor, broken cooling fans, or an issue in your electrical system.
How we fix it?
Remove & Reinstall Front Dashboard, To Change Aircon Cooling Coil, Expansion Valve & Change Aircon Compressor , Aircon Condenser.