1990 Nissan Maxima Logo
Posted on Aug 20, 2009
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The cooling fans will not turn on

We have changed the thermostate and the switch and still nothing y will these fans not turn on i have a nissan maxima 1990

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Radiator fan should turn on when the coolant reaches certain temperature. You can try turning on the AC and see if the fans are turning on first then diagnose further from there. If the fans turned on when AC is on then the fan motors, fan fuse and the relays are fine. You need to looking into coolant temperature sensor and the wiring's (there are 2 of them, not the one with single lead, that is the one goes to the temperature meter on your dashboard). If your coolant temperature sensor and wiring's are find then there could be a problem of the ECU.

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MIGHT NEED A COOLENT TEMP SWITCH,ITS LOC,UNDER THE HOOD

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The relays or fuses might of came unplugged even

  • alley1katt Aug 04, 2010

    replaced radiator, sensors, hoses

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