I've got a 1990 Buick Century with a 3.3 V6. The Buick factory manual
does not give the right instructions on how to remove the heater core
(you cannot do it by simply removing a cover from the engine
compartment where the heater hoses attach). It will have to be removed
from the interior. Can this be done without having to pull off most of
the dashboard? With the sound insulator and ash try removed it seems
there is still more things in the way before you can take off the
interior cover to the heater core.