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Tech tip: Is your temperature gauge bad?
by: Z Club of San Diego
This tip applies to the in-line 6 cylinder fuel injected engines, possibly the V-6 if they use
a sensor set up similar to the I-6. If the temperature gauge does not work, try the following:
At the front of the engine just below the water inlet hose is a fitting that has three or four
sensors, depending on the year of car. The one with a single bullet type connector with a yellow
wire is the temperature gauge sensor. Unplug the sensor and check with an Ohmmeter - the resistance
to ground should be about 450 to 550 Ohms at 70 to 80 degrees F. If the resistance is zero the
sensor is bad, if the resistance is infinity, the sensor is bad. I saw another problem where
the gauge did not work, but the sensor turned out to be good when I removed it and checked the
resistance with the sensor out of the car: The nut that retains the sensor in the housing had
rusted on the inside of the nut and insulated the sensor from ground. I cleaned the rust from
the nut using fine steel wool (00), washed the nut several times in Hydrochloric acid (muriatic)
and burnished it with 1000 grit sandpaper. Once the nut was clean the gauge worked fine. Or you
could go to the Nissan Dealer or Motorsport Auto and get a new nut for about $3, but cleaning it
got the car back on the road within an hour.
© 2007 Triad Z Club
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