Temperature sensor keeps going out

Tiny
JOE LONG
  • MEMBER
  • 2008 PONTIAC G6
  • 3.5L
  • V6
  • 2WD
  • AUTOMATIC
  • 84,500 MILES
I have already replaced this sensor twice since thanksgiving of 2016. What would be causing the sensor to keep going out?
Monday, January 2nd, 2017 AT 8:49 AM

3 Replies

Tiny
STEVE W.
  • MECHANIC
  • 13,465 POSTS
Which sensor? Engine coolant temperature? Ambient air temperature? How do you know it has failed?
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Monday, January 2nd, 2017 AT 12:00 PM
Tiny
JOE LONG
  • MEMBER
  • 2 POSTS
It is the engine coolant sensor and it makes my temperature hand not work and causes my fans to run constantly whine the car is running.
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Monday, January 2nd, 2017 AT 12:20 PM
Tiny
STEVE W.
  • MECHANIC
  • 13,465 POSTS
Okay, that is nothing but a simple thermistor sensor. Two wires and they go directly to the PCM. Take a voltmeter and check the yellow wire for voltage. It should have five volts key on engine off. Now check the other wire, it should be a ground. There is a color change in the wires (shows orange with black stripe changing to tan) so I suspect a connector in the ground side wire, If that connection is dirty it could cause a higher resistance in the circuit and possibly damage the thermistor. The only other option would be a bad run of sensors, maybe try a different parts store?
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Monday, January 2nd, 2017 AT 12:56 PM

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