Will my Ford Fiesta air conditioner blow out hot air?

It means that you either set the external circulation, or the air door between the engine and the fan is not tight, resulting in hot air leakage. If you turn on the air conditioner and the air conditioner hasn't blown in 10 minutes, try adding a R 134A. There may be insufficient refrigerant. If it doesn't work, you have to change the air conditioning compressor. Maybe the wiring is bad, and the compressor and belt don't match.