Before you replace or add anything, first make sure the fans are working. Turn on the AC and then get out and look under the hood, both fans should be turning. The fans should also turn on when drving and the temp reaches a certain temp: I don't remember what the actual number is supposed to be, but on both my '92 and '93 the temp starts dropping after the fans turn on when the gage is just a tad to the right of the white line at the 1:00 position on the gage.
Will, with that many miles on his engine, how can he have an original water pump? I'd heard and read that the water pumps only last up to 75,000 miles or so on the supercharged '92/93?
'99 Bonneville SLE, white, 112,000 miles
'02 Park Avenue Ultra, white diamond pearl, 88,000 miles