Why Does the Car Lose Power When Climbing Hills with AC On?

[Philip]

Insufficient power during uphill driving or when using the air conditioning may be caused by poor fuel quality. Below are the main reasons for power loss with AC operation: 1. Poor fuel quality: Excessive impurities or water content in the fuel will naturally lead to power deficiency. Low-quality fuel can easily clog components with small apertures or filtration functions such as the fuel pump screen, fuel filter, and injectors, resulting in inadequate fuel supply and reduced engine performance. 2. Severe carbon buildup: Excessive carbon deposits in the throttle body and intake manifold restrict airflow, preventing complete gasoline combustion and consequently reducing power output while increasing fuel consumption. 3. Clogged fuel filter: A long-unreplaced fuel filter fails to clean gasoline effectively, potentially causing critical filter blockage. Common symptoms include frequent stalling and ignition failures. 4. Fuel pump malfunction: Damaged or malfunctioning fuel pumps cannot maintain proper fuel delivery, ultimately leading to insufficient fuel injection, decreased engine power output, and vehicle performance degradation.