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To change the heater fan switch in a 1991 Chevy S10, first disconnect the negative battery cable to ensure safety. Remove the dashboard panel to access the switch, then unscrew and disconnect the wiring harness from the old switch. Install the new switch by connecting the wiring harness and securing it with screws, then reassemble the dashboard panel and reconnect the battery. Test the new switch to ensure it operates correctly.

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3w ago

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