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Coolant pump - check
1. On the heated engine running to pinch the upper radiator hose when the pump is working properly, then when you release the hose will feel the pressure of the liquid. 2. If the tear gland, the pump through a vent flow will be observed (see photo). 3. If the bearings are worn, the pump comes from the howling sound, while swinging shaft felt the longitudinal and radial play (see photo).
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