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With the accessory belts off, grab the nose of the water-pump pully and jerk back and forth. If you detect any axial play or clicking - replace it. Also, when you put it back together, do not tension the belt so much - this is part of why they fail early (kinda like over tightening wheel bearings).
Personally, I find it somewhat odd that you'd tackle a head gasket job but balk at a water pump?? The head gaskets are a much tougher job.
If you're still not sure, do a search in the GTV6 forum. I have a couple of good threads from last year when I did my de-tensioner and waterpump. Pretty much step-by-step. Oh, always make sure you have the appropriate pages from the shop manual handy when performing these jobs.
Good luck and do it right! - or you'll give new meaning to the phrase "exhausted and burned-out".
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