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Old 04-07-2014, 12:28 PM   #1
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Temp gauge and rad fan

I have an 02 9-3 and am seeing a couple of issues. First the temp gauge drops to cold while driving. Once you restart the car the gauge appears to be reading fine.

The other issue is the radiator fan is not kicking on. Need to determine if the problems are related and how to troubleshoot both.

Any and all help is appreciated.

James
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Old 04-07-2014, 12:44 PM   #2
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Dropping to full cold? Probably the coolant temp sensor. If its slowly going colder and colder, the thermostat may be faulty.
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Old 04-07-2014, 12:53 PM   #3
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Dropping to full cold. Where is the temp sensor located?
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Old 04-09-2014, 06:39 AM   #4
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Its most likely the thermostat. The temp sensors don't usually go bad. Does it throw a code? I just dealt with this problem. I had the same symptoms, my temp gauge would drop down all the way and the CEL would come on. The Scanner said that it was a temp sensor but upon further investigation it was the thermostat. They are both cheap enough to replace. This was also verified by a Saab Tech.
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Old 04-09-2014, 06:56 AM   #5
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mvadenais,

I just replaced the theromostat when I replaced the radiator. I bought it from Autozone, so it wasn't a genuine Saab part. Should I replace it again? I also have a CEL and will go get the code pulled.

If it is the temp sensor, where is that located? I should probably replace that as well?

Thank you a ton.

James
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Old 04-09-2014, 08:13 AM   #6
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The coolant temperature sensor is threaded into the side of the cylinder head right next to where the upper radiator hose bung is. The transmission end of the head.

If the thermostat you put in is the wrong temperature it will cause that. The code is probably for "Cooling system performance" and can be caused by a faulty (or wrong temp.) thermostat, faulty or failing coolant temperature sensor, or obstructions in the cooling system or fan airflow.

We always used to do the thermostat and coolant temp sensor together since you're already in there and it's quick to do both and avoid having to deal with the issue again.

You need an 89*C/90*C degree thermostat.
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