What Are the Common Troubleshooting Methods for Car Air Conditioning?
4 Answers
Here are the common faults and troubleshooting methods for car air conditioning: 1. The car air conditioning does not cool at all. First, identify the leak point, repair it, then re-evacuate and refill the refrigerant. 2. The cold air output is intermittent and uneven. Use a multimeter to check if the circuit switch, fan switch, and fan motor are functioning properly; inspect the compressor belt tension and the condition of the electromagnetic clutch coil. 3. The compressor cannot stop automatically. Check the suction pressure and discharge pressure at the compressor's intake. If the suction pressure is below the trip value, it indicates a faulty low-pressure switch; if the discharge pressure is above the trip value, it indicates a faulty high-pressure switch. If any damage is found, replace the pressure relay directly. Check the thermostat by cutting off its power supply to see if it can trip normally. Inspect the circuit for short circuits and any signs of wire damage.
When my car's air conditioning suddenly stops cooling in the summer, the first thing I check is whether the filter is clogged or dirty. Not replacing it for a long time can cause weak airflow and unpleasant odors. Cleaning it with a vacuum or simply replacing the filter can solve the problem. If that doesn't work, check if the refrigerant is leaking. If the pipe connections feel wet or have oil stains, it's time for immediate repairs. Sometimes, the fan makes loud noises, which could mean the blades are stuck or the motor is faulty. You can try tightening screws or adding lubricant yourself, but it's best to visit a professional shop to avoid making things worse—safety first!
As an average car owner, when there's no cold air from the AC vents, I usually first increase the fan speed and temperature to check the system's responsiveness. If there's a humming noise, the filter is most likely the culprit - replacing it only costs a few dozen yuan. For more serious issues like refrigerant leaks or compressor failure, I avoid touching those complex components since unstable voltage can be dangerous. Instead, I simply look up repair tutorials on my phone or call professional help. This saves time and hassle while prolonging the vehicle's lifespan.
When I drive my car and notice a foul smell from the AC, it's likely due to dust accumulation and mold growth on the filter. I promptly remove it, rinse it with water, let it dry, and reinstall it. Alternatively, if there's excessive moisture in the pipes causing mold, spraying some disinfectant should do the trick. If unfortunately, the compressor makes unusual noises, I try turning it off and restarting, avoiding sudden turns or brakes, and listen for any issues while idling at a red light to determine if a trip to the service station is necessary.
