the manual will tell u
Google 1996 Buick Regal Custom and see.
where is the drain plug for the radiator on a 1992 buick regal custom
A 1994 Buick Regal Custom uses 134a refrigerant, not freon.
The Sound I was hearing was the turn signal on reminder (sorry I have no manual)
total coolant capacity of 3.8L buick regal custom? doing a radiator flush so i need to know how much coolant to buy
All the Buick owners manuals (1993 - 2007) in pdf format are currently available here: http://www.extendedgmwarranty.com/owners-manual/buick_owner_manuals.html Please note: I am not associated with this website in anyway... was searching for the same manual myself and came across the above link and thought it might help someone else in the future.