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Gauge is probably driven by computer and not the output from the temperature sensor and so gauge reading does not have a direct relationship with the actual engine temperature.
Generic obd2 scanner will read data/faults that can affect the exhaust emissions, which a computer driven gauge will not. Dealer/manufacturer level bi-directional software would be needed for in-depth inspections of all non-emission related systems.
Hi Julia , why do you believe you need to find the temp sensor ? Temp gauge not working ? The cooling Temp sensor is a input to the PCM / ECM - engine computer .
Engine Coolant Temperature Gage
The instrument panel cluster (IPC) displays the engine coolant temperature (ECT) as determined by the powertrain control module (PCM) or the powertrain control module (PCM). The IPC receives a class 2 message from the PCM indicating the ECT. The range on the ECT gage is between 60-125°C (140-260°F). The ECT gage defaults to 60°C (140°F) or below if the PCM detects a malfunction in the ECT sensor circuit. Refer to Cooling System Description and Operation .
Would have DTC- diagnostic trouble code stored in Instrument cluster or the check engine light would be on . Before replacing a part you may not need take it to a qualified repair shop to have it diagnosed .
Inspect the fuse panel located in the side of the dash that is accessible when you open the door. I think that it is a 25 amp fuse but am not familiar with the G6
Does it stop charging or the light just comes on/gauge goes down? Plug it in and check if the alternator is putting out 13+ volts. It could be a short in the cluster or the wire from the alternator.
Sounds like a coolant temp sensor. Have it scanned, Autozone will do it for free. If the computer has a code in it for the coolant temp sensor it will lock the cooling fans on to prevent overheat because it has no idea what the engine temp is.
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