It is quite easy to recognize AC problems when people know what they are looking at. Here are some signs that will help to diagnose the AC problems: • Dusty air filters or refrigeration leakage leads to inefficiency issues. • Blocked condensate or evaporator coils cause warm air production. • Issues in the condensate drain line or pan can lead to water leakage issues. • Rattling noises indicates debris inside the AC system. • A screeching or squealing noise indicates towards damaged blower motor or fan.