What Causes Intermittent Car Air Conditioning Issues?
2 Answers
Intermittent car air conditioning problems may be caused by the following reasons: 1. Lack of Freon: Check for possible leaks by dripping water at pipe connections - bubbles will appear at leakage points. Repair the leaks and refill Freon at an auto repair or maintenance shop. 2. Dirty filter: Locate the bypass valve on the filter base; it opens when pressure difference reaches a certain level (engine oil normally flows through this passage to the main oil pipe). Use automotive lubricant on related components. 3. Insufficient antifreeze: Visit a 4S shop or auto repair center for professional inspection. 4. Aging AC core: Replace the old AC core with a new one purchased online. 5. Excessive refrigerant pressure: Check pressure with gauges and clean the condenser thoroughly. 6. Insufficient refrigerant (snow seal): With engine running, verify pressure readings and inspect the cooler's operation - weak cooling or airflow indicates low refrigerant levels, which requires professional replenishment.
I've encountered this issue before. The AC blowing hot and cold intermittently can be really annoying, likely caused by refrigerant leakage or pipeline blockage. When refrigerant is insufficient, the AC pressure drops, causing the compressor to work intermittently. Additionally, a slipping compressor clutch can also lead to this situation - pay extra attention if you hear buzzing noises from the engine compartment. Another possibility is electrical issues with the AC system, such as burnt relay contacts or poor temperature sensor connection. Like with my old car, the AC would cut out on bumpy roads but work fine on smooth ones. Don't forget to check the blower motor resistor too - it controls fan speed, and when faulty, the airflow becomes inconsistent. These problems are best diagnosed with professional equipment, and any repair shop should be able to handle them.
