Check that the AC is turned on and set to the coldest temperature
Verify the blower fan works on all speeds
Check the cabin air filter and replace it if clogged
Inspect the AC compressor clutch for engagement
Check the AC fuse and relay
Look for visible refrigerant leaks at hoses, fittings, and components
Use a manifold gauge set to check refrigerant pressure
Recharge the system with the correct refrigerant type and amount
Inspect the condenser for blockage, damage, or dirt
Clean debris from the condenser and radiator area
Check the serpentine belt for wear, looseness, or breakage
Inspect the AC compressor for noise or failure
Check the expansion valve or orifice tube for blockage
Inspect the receiver-drier or accumulator for moisture or damage
Test the blend door actuator if air is not cooling properly
Verify the cooling fans are operating correctly
Repair or replace any damaged AC hoses or seals
Vacuum the system before recharging after repairs
Have the system professionally serviced if refrigerant handling is required