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Q:

freeze plug advice and location on 1990 Pontiac Grand Prix

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
bad water leak
(1) Answer
there are 6 freeze plugs on the block. there are several in the heads. where is yor leak coming from? did you check the obvious first?

Roy