Dude (or Dudette) I just got my '98 Sable out of the shop. I had a
horrible overheating problem, but my car had a horrible
pinging/knocking/clattering problem. Mine also started to overheat after
the water pump went out and was replaced. I can't say for sure that this
is YOUR problem, but when I had my overheating problem fixed, it also fixed
the clatter/ping/knock problem. My problem was warped cylinder heads. It
cost $838 to have them fixed, but the engine is just as smooth and quiet as
a new one.
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