Ac not working properly don't know what it is. on 1998 Mercury Grand Marquis

Ac compressor is running but it's only blowing warm air. I don't think it's switching over. What can I do if anything.

Asked by for the 1998 Mercury Grand Marquis
The temperature blend door actuator inside the dash may not be turning the blend door to "cold". Do you happen to hear any clicking noise in the dash when turning the temperature to hot and cold? If so, the motor is likely faulty.