Hey guys and gals.

Can loose water pump bearings be the same as worn water pump bearings? Usually when I think of worn bearings, I think of seizing components. I recently replaced the water pump on my 99. The old and the new pump were identical, right down to the material that the impeller was made of. The only different I noticed while examing the two the that the old pumped turned with almost no resistance when I turned the water pump pully by hand. The new pump has a firmer feel and actually puts up a little resistances while turning it. Could loose bearings in a water pump cause air to get sucked into the coolant system at higher engine speeds? Could loose bearings on a water pump cause an engine to overheat?

Generally no, are you loosing coolant what exactly is the problem.

Generally no, are you loosing coolant what exactly is the problem.

Sorry, but. I just went to a mechanic and asked him the same question. In this case I was right. Because my pump had loose bearings, air was getting sucked in at higher engine speeds.

Wrong, How does a cooling system operating under 15 psi suck in air?. Yes shut if off and cool down, possible air could enter past the seal in pump not the bearing.