Question about 1995 Nissan Altima

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Both radiator fans run continuosly when the battery is connected.

Both radiator fans on my 1994 Altima will turn on when you connect power to the battery. I have to disconnect the battery to turn the fans off. Note that I just had the radiator fans replaced. The fans just continue to run as long as the battery is connected. Any idea what might be wrong?

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If it didn't do it before you had the fans replaced i'd say that they forgot to re-connect a wire to the ignition or something, causing it to have a continuous current, take it back to where you had the fans done and they should fix it free of charge, after all they did it.

Posted on Jan 29, 2009


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Answer to your question will really help us if you have a temperature gauge because we would not know what is the radiator water temperature.

but anyway...

try these steps...

first check if there is power(12V) to your relay. i mean power that will go to the fan as the relay is energize.

you have 4 pins in the relay. two is for energizing it . and two for the contact that will close once the relay is energized.

jump these pins for the contact, your fan should run. if it did not and there is power, then there is no connection from your relay to your fan.

if it would run, then we can trace the other two pins.

one pin should be directly connected to +12.

test this by using your volt meter.

the the other pin should be connected to your temperature controller that should give negative signal once the engine is hot. the temperature controller should short it out with the engine block which is a source of negative signal.

that should complete the circuit and should energize the relay that would in turn run the fAN,...

i hope you can follow all the tests...



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