1990 Other Nissan Models rad fan not turning on when hot

1990 NISSAN
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FIREFOX16
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Engine Cooling problem
1990 Other Nissan Models Two Wheel Drive Automatic 195000 miles
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hi, my rad fan doesnt want to turn on when its hot.
but its working. i wonder what the problem is.
also, it doesnt want to idle when its in drive gear
why is that?
Feb 25, 2008 at 1:57 PM
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RASMATAZ
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Could be the temperature switch/fan relay-for the idle problem-check the auxilliary air control valve and throttle switch/throttle position sensor.
Feb 25, 2008 at 2:01 PM
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FIREFOX16
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i remove the relay and hard wired it and the fans worked,
what would the problem be now? is it the censor?
how do u check the censor for the fan?
Feb 25, 2008 at 2:06 PM
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RASMATAZ
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Measure its resistances hot and cold-if okay you have a wire problem to the computer it depends how its wired into the system
Feb 25, 2008 at 5:20 PM