What Causes Severe Body Vibration When the Fan is Running?
2 Answers
If the vibration occurs only when the fan is running, the issue likely lies within the cooling fan system. Additionally, there are several other possible causes: 1. Check the dashboard for warning lights: If the engine warning light is on, it may not just be a fan issue—there could also be a problem with the engine itself. In this case, it's advisable to take the vehicle to an authorized 4S dealership for a more detailed diagnosis and repair by a professional technician. 2. Worn-out fan motor drive: Inspect the fan motor drive. Excessive clearance, severe wear, or a stuck motor shaft can cause the fan to wobble during operation, leading to body vibration.
I encountered this issue recently and found it was caused by aging engine mounts. The rubber block in the engine mount hardens and cracks over time, losing its damping effect. When the fan spins, engine vibrations are directly transmitted to the chassis. Especially with AC on and the fan running at high speed, the entire dashboard vibrates noticeably. My mechanic friend suggested testing by turning on the AC, placing hands on the steering wheel to feel vibration frequency, while observing engine movement. He warned not to delay fixing this - worn mounts can also strain coolant hoses and wiring harnesses, potentially leading to serious cooling system issues. After replacing the mounts, the chassis became quiet immediately. Remember to inspect other supporting components for deformation too.