What Causes the Engine to Stall When Starting with AC On?

[SimonLynn]

Stalling when starting the car with the AC on may be caused by unskilled driving or dirty components. The specific reasons are as follows: Dirty Components: The main reason for stalling when starting with the AC on is excessive dust in the air. During engine operation, the idle speed motor valve core and throttle valve seat accumulate a lot of dirt. When too much dirt builds up, the engine may experience low idle speed, unstable idling, and stalling while driving. The solution to this problem is simple: just clean the idle speed motor. Unskilled Driving: If the AC is turned on while in a low gear, it consumes a significant portion of the engine's output power, leading to insufficient power. To maintain the same level of performance as without the AC, the driver must increase the degree of clutch release and pedal movement to achieve the same power effect. However, increasing the clutch and pedal movements can be challenging for beginners who haven't developed muscle memory, often resulting in abrupt changes in vehicle speed and, worse, stalling.