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Old Jun 24th, 2007, 03:05 PM   #1 (permalink)
KDragon
Nissan Enthusiast
 
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Join Date: Oct 2006
Location: WI
Posts: 126
Question Cooling fans never turn on

My problem seems to be that the fans never come on even if its 80+ outside and driving for an hr+ mixed city and hwy.

The only time they turn on is if i disconnect the temp sensor then i also get a CEL light (duh). I just replaced the sensor and theres no difference.

However if i put a 150 ohm resistor in the place of the sensor the fans fire right up w/out the CEL. The only thing i can think is its just not getting hot enough.

So I figured I would get a new temp sensor since people say it can help with gas too. So I go to in put in and no difference. I would think they would be running if its 75-80F outside and I'm running the car hard.

BTW the voltage from the ECU to the sensor is 5.80v-5.90v and I have read that it should be an even 5.00v could this be the problem?
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