I am replacing heater core on pontiac grand am (97). Does anybody know the size of the nuts to take it

  • Thread starter Thread starter mark h
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mark h

I am replacing heater core on pontiac grand am (97). Does anybody know the size of the nuts to take it

off? I am looking for the size on the nuts just outside of firewall
 
there is no need to remove any nuts from the firewall. Just remove the 2 hoses from the outside and then everything else is done from the inside.
 
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