Get the 10 gauge wire and place it through the hole in your fire wall.
Car fan relay switch.
If the fan does not work at all start in the fuse panel.
Check the fuse panel s.
If the fan works in the slower speeds but not the high speed there may be a problem with the fan relay.
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The temperature controlled switch is designed to turn the fan on when coolant temperatures reach 195 degrees and turn off the fan when temps drop to 185 degrees.
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This will be the wire that connects your switch to your fan power wire.