Pontiac Repair: 95 bonnie belt tensioner, haynes manual, square hole

Question
Have a Haynes manual and can't find anything about r&r of the belt tensioner. It looks as though coolant runs through it, are there any tricky fittings? Is it pretty straight forward or are there some pit falls to watch out for? Any special tools?

Thanks, Joe

Answer
 I think you might be looking at the water pump.
one wrench, one 3/8 drive ratchet are the tools that you will need.
 There is a 3/8" square hole on the end of the tensioner, you use that hole to push against the spring and get the belt on or off.