What Are the Causes of Cabin Resonance Humming?
2 Answers
The causes of cabin resonance humming are: 1. Resonance caused by engine mounts, leading to noise; 2. Noise generated by the front part of the engine, generator bearings, pump bearings, or compressor bearings; 3. Aging engine mounts causing resonance, which need replacement. Methods for engine maintenance include: 1. Using qualified engine oil; 2. Using qualified coolant and antifreeze; 3. Regularly cleaning radiator scale; 4. Regularly removing engine carbon deposits; 5. Regularly replacing the car's three filters; 6. Maintaining reasonable RPM. The function of the engine is to convert thermal energy into mechanical energy by expanding gas after combustion in a sealed cylinder, pushing the piston to do work, thereby providing power for the vehicle.
My car used to have that humming noise too, especially noticeable when driving at 80-90 km/h on the highway. At first, I thought the window wasn't closed properly, but later I realized the entire cabin was vibrating. After taking it to the repair shop, the mechanic said there could be multiple causes – the most troublesome being unbalanced tires, as uneven rotation can cause the whole body to shake. Another issue was broken exhaust pipe hangers, making the exhaust system unstable and prone to swaying. Worn-out engine mount bushings are also problematic, as poor vibration isolation allows vibrations to transmit inside. Additionally, loose wheel bearings can cause humming at certain speeds. Randomly placed items inside the car can contribute too – my unsecured toolbox in the trunk turned out to be the main culprit. In short, any of these faulty parts can trigger resonance, so each needs to be checked systematically.
