Is it necessary to take out the engine replace a freeze plug on 1997 Buick Skylark?

Generally, no, you do not need to remove the engine to replace a freeze plug on a 1997 Buick Skylark. Many freeze plugs are accessible from underneath the car, though some might require partial disassembly of components like the exhaust manifold or other parts depending on the location of the plug.

However, the exact accessibility depends on *which* freeze plug needs replacing. Some are easier than others. A mechanic would be able to tell you for sure after inspecting the vehicle. Attempting the repair yourself without experience could lead to complications. If you're not comfortable working on cars, it's best to have a professional handle it.