Why does the car shake when the AC is turned on?

1 Answers
McRose
07/30/25 7:55am
Opening the AC causes the car to shake for the following reasons: 1. Throttle: As the vehicle's mileage increases, carbon deposits accumulate in various places, especially on the throttle. If the throttle is dirty, it can obstruct air intake, causing the engine to struggle or barely manage to drive the compressor. This results in the car shaking when the AC is turned on. 2. Engine: The engine naturally vibrates during normal operation (including after starting the compressor), but these vibrations are usually dampened by the engine mounts, making them less noticeable. If the engine mounts collapse or are damaged, the engine's balance is disrupted, and turning on the compressor may reach a resonance frequency, intensifying the vibrations.
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