Ac has free on but only blows hot air.

Air conditioning system faults can be caused by multiple concerns. First, you could have an electrical concern, such as with the compressor clutch or electrical field. You could have a cycle switch issue. You could have an issue with the temperature controls inside the vehicle. Further in the refrigerant system, you could have a situation where the pressure is too high or low in the system causing the system to malfunction. A skilled technician certified in refrigerant handling will be able to assist you.