It sounds like there might be an issue with your car's air conditioning system. The behavior you described, where the AC blows warm air when it's hot outside and cold air when it's cooler, is not normal and suggests that there could be a problem with the AC system. Several factors could be causing this problem:
Low refrigerant: The most common reason for inconsistent cooling performance is low refrigerant levels. If the refrigerant level is low, the AC system will struggle to cool the air effectively, especially during hotter weather.
Faulty compressor: The AC compressor is responsible for compressing the refrigerant and circulating it through the system. If the compressor is malfunctioning, it may not be able to provide sufficient cooling during high-temperature conditions.
Airflow issues: Problems with the blower motor or a clogged cabin air filter could restrict airflow through the AC system, leading to reduced cooling performance.
Temperature sensor issues: Your car's AC system relies on various sensors to monitor and adjust the temperature. If any of these sensors are faulty, the system may not respond correctly to changes in outside temperature.
Condenser or evaporator problems: A damaged or blocked condenser or evaporator can prevent proper heat exchange, affecting the AC's cooling performance.
To pinpoint the exact cause of the issue, you should take your car to a qualified mechanic or an automotive AC specialist for a thorough inspection. They will be able to diagnose the problem and provide you with a solution. AC system repairs can range from simple fixes like recharging the refrigerant to more complex repairs like replacing components. It's essential to address AC issues promptly to avoid further damage and discomfort while driving.