If you disconnect the plug going into the temperature sensor on the engine lid the stock fan will run continuously.
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You can then simply swap fans, provided your new fan doesn't draw substantially more current than the stock one, which is unlikely.
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The wiring to the stock fan should be Blue with Red stripe
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+ 12v and black with White stripe
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(
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-12v), just connect those to the correct wires on your new fan.
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Paul