Why does the car air conditioner not cool when idling?
2 Answers
Common car air conditioner compressors are driven by the car engine. If the engine stops, the compressor also stops. Once the compressor stops, it will no longer provide cooling. Other reasons are as follows: 1. Damaged air conditioner flap: The failure of the air conditioner flap motor is relatively rare, but it does happen. If the flap motor has a problem, it becomes more troublesome. The flap motor is usually located in the lower middle part of the instrument panel and serves as the main switch for the air vents. If it fails, it means the switch is damaged, and cold air can only escape through gaps, which is like trying to quench thirst with poison. 2. Aging or loose belt: The belt is often an overlooked component. Generally, during maintenance, 4S shops will remind you to replace the belt. If it is not replaced, slipping may occur during use, leading to belt breakage, belt noise, loss of power assistance, and poor air conditioning performance. Therefore, it is also necessary to check the engine belt.
I've been driving for many years and have encountered situations where the air conditioning doesn't cool when idling. This could be due to insufficient refrigerant or a leak, preventing the entire system from effectively cooling. If the compressor is faulty or worn out, it's more noticeable when the engine is idling at low speeds, and the AC won't blow cold air. A condenser surface clogged with leaves or mud can also affect heat dissipation. It's recommended to check if the AC switch is on and if the cabin air filter is dirty after parking. If necessary, use a thermometer to measure the vent temperature. If it's abnormal, visit a repair shop promptly—don't wait until a hot day when problems worsen. Safety first! Additionally, parking in environments like hot basements or under strong sunlight worsens heat dissipation, leading to weaker cooling performance. Staying vigilant can save you trouble.
