Why does the car air conditioning only cool when accelerating?

[Reese]

The following are the possible reasons why the car air conditioning only cools when accelerating: 1. Insufficient battery voltage: The car air conditioning requires electricity. If the voltage is insufficient, it won't cool properly. When accelerating, the engine generates more electricity to power the battery, allowing the air conditioning to function normally. 2. Compressor operation status: If the compressor belt slips, it affects power transmission, causing insufficient pressure at low speeds; internal component damage or abnormal noises in the compressor due to wear can prevent effective compression; a slipping compressor clutch can also lead to insufficient compression pressure. 3. Condenser and fan condition: Severe blockage of the condenser radiator reduces its efficiency at low speeds; check if the condenser fan is faulty - abnormal noises or poor motor operation can result in insufficient airflow at low speeds. 4. Refrigerant level inspection: Check the observation window for excessive bubbles, indicating insufficient refrigerant; if no bubbles are visible after cooling, it means too much refrigerant has been added; inspect high and low-pressure pipes and connections for leaks, which require repair or replacement if found.