The exact procedure varies for the engines that were available in this car. Roughly:
how do you remove a water pump on a 1998 buick park avenue?
under the bonnet
passenger side under dash. cover has to be remove to see it
unbolt it
You cannot remove what it does not have. Your Buick does not have a governor. Speed is controlled by the ECU.
Specs 98 Buick Park Ave rear pads
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A repair manual for the 1998 Buick Park Avenue would have a brakes repair diagram. A popular book is the Haynes Repair Manual.
The 98 would have R134a
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3.8 litre
3.8 liter