Need to replace the water pump
In the 2.7L V6, the water pump is driven by the timing chain. I'm pretty sure that in the 3.2/3.5L V6, it's driven by the timing belt. In both cases, it's a lot of work to get to, as you have to remove everything on the top (intake plenum, valve covers) and front (belts, pulleys, idlers, p/s pump, and timing cover) of the engine. Then, after removing and replacing the water pump and timing chain/belt, you have to make sure that the valve timing is exactly right, and reset the chain tensioner on the 2.7L.
A lot of work. Unless you're very comfortable with working on engines, leave it to a professional. You'll save yourself a headache (not to mention some busted knuckles). ;-)
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