Remove the belt,fan and pully their is a small hole in the bottom of the water pump you will be able too tell if its been leaking out of their, if so replace the waterpump
we've been having the same problem with our Chevy. I've been taking it in before the warranty ran out. To no avail they don't have any answer to this. We have replace the water pump, intake manifold, gasket, core plug and flushed. I think every 1/10,000 chevy truck had this problem and I happen to get stuck with one. Currenty, we gave up trying to fix the problem and just make sure that it don't goes empty on the coolant. Any take on this.
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