Why does the Jetta water pump keep failing

1 Answers
ErinLee
07/29/25 11:34am
Here are the reasons why the Jetta water pump keeps failing: 1. Unstable idle speed: Water pump failure can increase the rotational resistance of the pump. Since the water pump is connected to the timing belt, increased rotational resistance can directly affect the engine's rotation. At idle, this manifests as fluctuations in RPM after startup, which is more noticeable in winter and may even cause stalling. 2. Noise from the engine area: This sound is a rotational friction noise, similar to a "grinding" sound. The noise may increase with engine speed and vary in volume. Generally, this noise becomes more pronounced as the severity of the fault worsens. 3. Abnormal noise from the water pump during engine operation. The abnormal noise may be caused by foreign objects inside the pump or bearing wear.
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