Low pressure port which is the larger hose.
R134a
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Google 1996 Buick Regal Custom and see.
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Yes
R134a
Refrigerant for a 1996 Buick Skylark is inserted into the low pressure AC hose. This hose is found on the left side of the engine bay.
A free vacuum diagram for a 1996 Buick Regal can be found in its manual. It can also be obtained at an auto part store, as a print off.
hi
you take it to alignment shop and have them adjust it after they take measurements.
With proper maintenance probably forever