goodman 5 ton unit R-22

goodman 5 ton condensing unit, R-22, the tubing at bottom has a leak, unit will run for about 5 minutes then shuts off. Exhaust fan motor is about 2 years old. body in good shape. call 417-736-9204 also have 5 ton coil R-22 for 15.00 no leaks in it. checked compressor, it shows good on instruments.