What Causes Abnormal Noise in New Energy Vehicle Electronic Water Pumps?
2 Answers
There are several possible causes for abnormal noise in new energy vehicle electronic water pumps: 1. Cavitation noise. The sound produced when cavitation occurs in the water pump. 2. Loose component noise. Caused by rotor components making noise due to shaft looseness. 3. Bearing abnormalities. Newly replaced bearings may emit a low humming sound due to excessive radial tightness during assembly, making it difficult for the rolling elements to rotate. The bearing temperature will rise. When there is insufficient oil in the bearing housing, the bearing will emit a uniform whistling sound during operation, requiring oil replenishment. If the gap between rolling elements and the cage is too large, the bearing will produce a uniform whistling sound during operation. If peeling occurs on the raceway surfaces of the inner or outer rings or on the rolling elements, intermittent impacts or pulsations will be heard during operation. If the bearing is damaged, a cracking or rattling sound will occur during operation.
I recently encountered this issue too. While driving, I heard a buzzing sound coming from the electric water pump, which was quite bothersome. Later, when I took it to the shop for inspection, the mechanic explained that there could be several reasons. The most common ones are air entering the water pump or insufficient coolant, causing abnormal noises during operation. Additionally, worn-out water pump bearings can produce squeaking sounds, especially in older cars. Another possibility is a loose impeller or foreign objects being sucked in. I believe this issue shouldn't be delayed and needs immediate attention, as the water pump is crucial for cooling the motor and battery. If it fails, it could lead to overheating problems. In my case, the inspection revealed that the bearings were damaged. After replacing the water pump, everything became quiet again. The whole process took about half a day, and now it's running smoothly.
