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Technical Support / Re: C9 CAT t'stat housing frozen bolt
« Last post by Carl Boger on Today at 12:08:57 AM »Don,
I have to agree with Eric that heat is probably your best bet. Since that is impractical right now try a can of freeze out along with numerous shocks to the bolt head with a hammer, or rocking action with a small impact going in forward and reverse multiple times to hopefully break it loose.
You may have to do this numerous times and it may or may not work. If you get to the point that the bolt breaks I have had decent luck drilling them out with left twist drill bits after leveling and center punching the shaft. Hopefully you won't get to that point.
Hopefully this will help you or at least give you some ideas.
I have to agree with Eric that heat is probably your best bet. Since that is impractical right now try a can of freeze out along with numerous shocks to the bolt head with a hammer, or rocking action with a small impact going in forward and reverse multiple times to hopefully break it loose.
You may have to do this numerous times and it may or may not work. If you get to the point that the bolt breaks I have had decent luck drilling them out with left twist drill bits after leveling and center punching the shaft. Hopefully you won't get to that point.
Hopefully this will help you or at least give you some ideas.