I don't recall ever seeing a water pump lock and then free itself, that would have been the last thing I would have suspected. In fact, I don't recall ever seeing one lock. Leak, rattle, break off, but never lock up!
I've got an 01 4.8 Silverado. The factory pump went 100,000 and started leaking. Went through 3 new aftermarket pumps, first one leaked at the seal, second one the pulley broke around the weld, third leaked around the upper hose neck. All withing 6 months, all warranty with different brands.
Finally gave up and paid the price for a Delco pump, so far so good, better not brag though!
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Today's Featured Article - An AC Model M Crawler - by Anthony West. Neil Atkins is a man in his late thirties, a mild and patient character who talks fondly of his farming heritage. He farms around a hundred and fifty acres of arable land, in a village called Southam, located just outside Leamington Spa in Warwickshire. The soil is a rich dark brown and is well looked after. unlike some areas in the midlands it is also fairly flat, broken only by hedgerows and the occasional valley and brook. A copse of wildbreaking silver birch and oak trees surround the top si
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