1. Low refrigerant level: This is the most common cause of AC failure. The refrigerant is the fluid that circulates through the AC system and absorbs heat from the air inside the car. If the refrigerant level is too low, the AC will not be able to cool the air effectively.
2. Faulty compressor: The compressor is the heart of the AC system. It compresses the refrigerant and circulates it through the system. If the compressor is faulty, the AC will not be able to function properly.
3. Faulty expansion valve: The expansion valve controls the flow of refrigerant into the evaporator. If the expansion valve is faulty, the AC will not be able to cool the air effectively.
4. Electrical issues: The AC system is powered by several electrical components, such as the AC relay, the AC clutch, and the blower motor. If any of these components are faulty, the AC will not be able to function properly.
5. Other issues: Other issues that can cause the AC to stop working include leaks in the AC system, a faulty condenser, or a faulty evaporator.
If the AC on your 97 Cavalier is not working properly, it is important to have it diagnosed by a qualified mechanic to determine the exact cause of the problem and have it repaired.
