how to replace the heater core?
heater core replacement. on 1995 Buick Riviera
On line service information is available from AutoZone - www.autozone.com. If they don't have what you need Alldata has a DIY section but there is a price for their information.
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buy a manual or take it to a qualified dealer, or go to a junk yard and pull one out to get the experience, but don't buy the old one, you are gaining experience
ITS a bitch but the hardest part is getting the hoses off then back on,very little room,and make sure when dismantleing all the interior that you note where all the h,v,a,c venting goes and what has to be removed to get to it.(carefull do not force it )