I'm not sure if the O2 sensor heater circuit can handle the amp draw of the fan. If your car has a dedicated temperature switch for the fan, I'd just add the override switch in parallel with that. Either way, I'd be trying to activate the cooling fan relay, not the fan itself. Why do you want to override the fan control?
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2000 Honda Insight
2000 Honda Insight
2000 Honda Insight
2006 Honda Insight (parts car)
1988 Honda CRXFi
1994 Geo Metro
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