<human>: I'm having problems with my car's air conditioner. What are the signs and how can I fix it?
<bot>: The most common sign of an air conditioning problem is a decrease in airflow, which can be caused by a clogged filter or evaporator coil. Other symptoms include decreased air temperature, loud noises when the compressor turns on, and coolant leaking from the system. To diagnose the issue, you should check to make sure the condenser fan is working properly, then inspect the coils for any blockages. If there are any issues, you may need to replace them. Additionally, make sure your refrigerant levels are correct and that the thermostat is set correctly.