Coolant pump — check (Chevrolet Tahoe 1)

1. If after any of the three checks discussed below it turns out that the coolant pump is faulty, it must be replaced immediately.

2. Warm up the engine. Squeeze the upper radiator hose. If the pump is working properly, you should feel fluid pressure.

3. Using a mirror, check the condition of the pump shaft seal. If a leak is detected, replace the pump through the inspection hole (see photo).



4. If there is constant increased noise coming from the pump shaft, the cause is wear of the pump impeller shaft bearing. Check the bearing lateral play by removing the belt and shaking the pump hub (see photo). If there is play in the horizontal and/or vertical directions, replace the pump.



(Original version of the article on the website: «chevyman.ru»)