If your car’s AC isn’t cooling, start by checking the refrigerant level—low refrigerant often causes warm air. Use a recharge kit to refill if needed. Next, inspect the compressor; if it’s not clicking on, the problem could be electrical. Look at the fuse box and replace any blown fuses. Also, check the cabin air filter for blockages. Unusual noises may suggest a faulty compressor or belt. If you find oily residue, it may indicate a refrigerant leak. For complex issues, it’s best to visit a professional technician. Regular maintenance helps keep your AC running efficiently.