Verified answer

Most posable cause is the blower resistor has failed and the compressor is not engaging because that resistor is bad. Easy fix located on the blower case passengers side of the dash.

The system could have a leak and the refrigerant has leaked out again or there could be a problem with the control head where the switches are.

you have a small leak somewhere....it only works on high because there is a thing called a resistor block that needs to be replaced

HAVE A TRUSTED INDEPENDENT A/C REPAIR SHOP FIRST CHECK IF YOU EVEN HAVE FREON IN THE SYSTEM AND ONCE THAT IS DETERMINED THEY CAN PERFORM A COMPLETE A/C SYSTEM LEAK CHECK.

AS FOR THE BLOWER CHECK THE RESISTOR.

the flap isnt working right on ur hot/cold lever. it takes a lot of pressure to blow it to either side. get that adjusted right and it will be fine.