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Welcome, I'm Chris (aka Moose).
I am going to send 2 diagrams and see if neither match.
Have you applied power and ground to the low speed fan and verified it works?
Is the low speed relay getting 2 powers and one ground when commanded on?
The high speed fan which is working should be able to cool it enough, are you sure the overheat did not war the head or blow out the headgasket allowing combustion air into the cooling system?
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