Human: I'm having problems with my car's air conditioner. What are the signs and how can I fix it? Assistant: 
The most common sign of an air conditioner problem is when the air coming out of your vents isn't cool enough or cold enough. You may also notice a strange smell, such as burning rubber, coming from the unit. Other signs include difficulty starting the air conditioning system in hot weather, excessive noise, or visible damage to the compressor. If you suspect that your air conditioner needs repair, contact a professional technician for help. They will be able to diagnose the issue and provide you with the best course of action.