What Causes Car Vibration When the AC is On?

1 Answers
VanNolan
07/29/25 4:19pm
Car vibration when the AC is on is primarily a symptom related to the throttle body and engine. The detailed causes and solutions for car vibration when the AC is on are as follows: 1. Carbon buildup in the throttle body: Turning on the AC increases the engine load, prompting the engine control unit to command a larger throttle opening to maintain idle stability. Excessive carbon buildup in the throttle body can cause unstable idling, leading to vibration. Solution: Clean the throttle body. 2. Poor quality rubber components inside the engine mounts. Solution: Visit a 4S shop to install higher-quality rubber components inside the engine mounts.
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