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2008 g6 temp gauge doesn't work and both fans run constantly

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I'd check the coolant temp sensor. Are there any applicable trouble codes? Some makes and models if that sensor is disconnected, the fan control system may default and the fans may run all the time.

Posted on Dec 15, 2016

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Posted on Jan 02, 2017

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2001 montana cooling fans not coming on


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I have a 1995 nissan altima.I changed the motor on it twice .The third motor I got from a 2000 altima ,same motor different year. Anyhow when running the motor,if I plug in the fan switch the fans will not...


You have quite a situation. It sounds as though the Coolant Temperature Sensor is faulty. That sensor will control the temp gauge in the dash as well as control the cooling fans when necessary. As to why the fans are constantly running whether the switch is on or not would mean that there is power to the fans bypassing switch, possibly from another connection in the harness. First off I would try replacing the fan relay, it may be stuck closed, just switch it out with another of the same type connection from the fuse box to see if there is any change. If that doesn't work then I would check to see if the wiring from the coolant temp sensor and the fan switch run through the same area of the harness. Its possible that you may have a short circuit at that point. That may possibly explain why the gauge is reading hot when the motor in fact is not. Hope this helps. Good Luck.

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The most likely cause is due to the radiator fan constantly running and the engine not getting to operating temperature, thats why your temp gauge isnt going up, check all related wiring to the cooling fan and make sure there no bare wires that could be causing a short to ground causing the fan to constantly run, secondly check the fan relay, if all of that checks out check the coolant temperature sensor because the information from that sensor tells the computer when to turn the fan on and off, if the sensor is bad it could be telling the computer the engine is hot when in fact its not.

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is the temp gauge working? sounds like coolant temp sending unit... or a possible engine coolant temp sensor or ect sensor.

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