The freeze plugs on a 1989 Chevrolet pickup with a 305 engine are located on the engine block. There are two freeze plugs on the driver's side and two freeze plugs on the passenger's side. The freeze plugs are located in the lower part of the engine block, just above the oil pan. They are round, metal plugs that are pressed into the engine block.
The purpose of the freeze plugs is to allow coolant to circulate around the engine block and head. If the coolant freezes, it can cause the engine block to crack. The freeze plugs provide a way for the coolant to expand when it freezes, preventing the engine block from cracking.
