What Causes Intermittent Cooling in Car Air Conditioning?
2 Answers
Car air conditioning intermittent cooling failure reasons are as follows: 1. Excessive refrigerant: Too much refrigerant can cause system pressure to frequently exceed the normal upper limit, triggering pressure protection and shutting off the air conditioning. 2. Poor condenser heat dissipation, leading to high pressure. 3. Evaporator: The evaporator temperature is too low, causing the system to automatically shut off the air conditioning. 4. Freezing: Freezing of the evaporator or expansion valve results in high pressure. Ice can block the air duct, preventing cold air from being blown out. 5. Low system pressure. 6. Poor contact in control circuits. 7. Adjustment of the air conditioning pressure plate gap.
I've encountered the issue of the air conditioning blowing cold air intermittently several times, which is usually caused by insufficient refrigerant or a leak. Unstable pressure in the AC system can cause the compressor to cycle on and off. Problems with the compressor clutch are also common—if its coil has poor contact or is worn out, it may stop working randomly. A faulty thermostat is another factor, as it fails to maintain stable temperature control. Additionally, a dirty cabin air filter blocking airflow can cause the evaporator to freeze up, obstructing cold air. Loose fans or belts reducing cooling efficiency can also lead to intermittent issues. I recommend quickly checking the filter and fan operation under the hood yourself, but for safety, visit a repair shop as soon as possible to check refrigerant levels and potential leaks. Delaying repairs can cause more severe damage to the compressor or other components.
