Start the car and set the AC to max cool with high fan speed to verify the issue.
Inspect the cabin air filter and replace it if it’s dirty or clogged.
Open the hood and check if the AC compressor clutch engages when AC is turned on.
Connect an AC manifold gauge set to the low and high pressure ports to check refrigerant levels.
Compare pressure readings to normal operating ranges to determine if refrigerant is low.
Inspect AC lines and components for oil residue or damage that may indicate a leak.
Use a UV flashlight to check for leaks if UV dye is present in the system.
If refrigerant is low and no major leaks are found, recharge the system with the correct type.
Ensure the condenser fan turns on when the AC is running to aid in cooling.
Check the AC fuse and relay in the fuse box and replace if blown or faulty.
Test the AC pressure switch for continuity and proper function using a multimeter.
Listen for unusual noises from the compressor that may indicate internal failure.
Inspect the blend door actuator under the dash for proper movement and function.
Use a scan tool to check for AC-related trouble codes if the system is electronically controlled.
Ensure all electrical connectors to AC components are clean and securely attached.
After repairs, run the AC and measure vent temperature with a digital thermometer.
Confirm the compressor cycles properly and the air is cold at the vents.
Check for recurring issues over the next few days to ensure the repair was successful.
Dispose of any replaced parts and refrigerant according to local regulations.
Wear gloves and safety glasses when handling refrigerant or working near moving parts.
