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[Andy B]

Originally genuine water pumps were cheap as chips so it was a no brainer to change it "while you were down there".
The price then shot through the roof,so people started fitting pattern versions just to follow the line of changing the pump at the same time as the cambelt. So, there now seems to be two schools of thought on the subject.

I still chose the 'if it ain't broke ........' option 
If you're paying someone else to do the work, there might be an argument, but if you do it yourself, fix 'em if they break/leak 

[Murph]

As has been said - live and learn.

Mine was fine but the Cam belt was overdue when I bought the car so I did both because that's what I've always done.

Unfortunately I chucked the old one.

I take it it would be advisable to fit a new belt if I decide to change the pump again?

I need to do the dowty washers and the O/S outlet manifold gasket soonish so maybe I will just do the lot in one hit.

[Andy B]

....

I take it it would be advisable to fit a new belt if I decide to change the pump again?
 ......

Cam belt? Why would you?  Cam belt drives the cams ....... 'fan belt'/aux belt drives the water pump. Two separate things. 

[Murph]

D'oh!
Sorry - I was thinking in terms of my other car which is cam belt run.   

[JamesV6CDX]

So the moral of the story is that if it's not broke, don't fix the original OE pump when you do your cambelt. 

I changed it because it had been on the car for 4 years so thought i would play safe and change it. Shows what thought did eh

The one that came off your car from memory wasn't GM, and felt equaly as rough....