![]() ![]() With the engine running and the A/C switched off, listen for knocking or rumbling sounds in the vicinity of the compressor. See How To Recharge Your Car's Air Conditioner for more information on how to add refrigerant.ģ. If low, add refrigerant to bring the system up to full charge. Pressure gauges can be used to check the refrigerant charge. Is the A/C system blowing cold air? Luke warm air or air that is barely cooled at all could indicate a low refrigerant charge in the A/C system. (Note: Some A/C systems prevent compressor clutch engagement in low temperatures, typically at or below 40 degrees F.)Ģ. Have it checked by your service technician. If this is happening, it could also indicate low refrigerant or some other problems. Also, listen for rapid clicking or cycling noises at the compressor when the A/C is switched on. ![]() With the engine running, does the compressor clutch engage when the A/C is switched on? If it does not, this usually indicates a low (or empty) refrigerant condition, or an electrical problem. Stay away from all rotating components with your hands, clothing, and hair, and always wear eye protection around a running engine.ġ. Note: Always be extremely careful any time you are under the hood while the engine is running. The following tips on how to check your car's air conditioning system has been provided by the Mobile Air Conditioning Society (MACS): You should check your car's A/C system BEFORE hot weather arrives to make sure it is working properly and blowing cold air. How to Check Your Car's Air Conditioning System by Larry Carley copyright Please note that the tool that you receive after placing an online order may be in a used but operable condition due to the nature of the Loan-A-Tool® program.How to Check Your Car's Air Conditioning SystemĪuto Repair Library, Auto Parts, Accessories, Tools, Manuals & Books, Car BLOG, Links, Index Do not wear ties or loose clothing when working on your vehicle.įREE Loan-A-Tool® program requires returnable deposit. Should electrolyte get on your body or clothing, neutralize it immediately with a solution of baking soda and water. Always wear gloves and safety glasses and other personal protection equipment, and work in a well-ventilated area. Sulfuric acid is caustic and can burn clothing and skin or cause blindness. Use caution when working with automotive batteries. Always disconnect the negative battery cable before servicing an electrical application on the vehicle to protect its electrical circuits in the event that a wire is accidentally pierced or grounded. Always chock your wheels prior to lifting a vehicle. Refer to the service manual for specific diagnostic, repair and tool information for your particular vehicle. Information is accurate and true to the best of AutoZone’s knowledge, however, there may be omissions, errors or mistakes.īe sure to consult your owner’s manual, a repair guide, an AutoZoner at a store near you, or a licensed, professional mechanic for vehicle-specific repair information.
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