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Old 02-21-2015, 04:46 PM   #1
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Temp gauge question

I have a 98 Saab 900s that I recently purchased and don't know much about. I noticed that yesterday while driving down the interstate @ 80 mph on a 60 degree night that the temp gauge was only about a quarter way up on the gauge. (between halfway and cold). While driving in town and stop and go traffic the gauge is pegged at the center of the gauge. Never seen a gauge sit this low and was curious if this is normal.

I believe the water pump is pumping because if I remove the small hose on the top of the coolant reservoir, the coolant slowly trickles out and if I increase the rpms, the coolant flows much faster. I performed a coolant flush to get all the nasty junk that was in there out.

Thanks for any insight. I can also supply pics if needed.
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Old 02-22-2015, 06:05 AM   #2
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It sounds like you have a partially bad thermostat. There's more cooling air going to the radiator at highway speeds making it decrease the temperature of the coolant more efficiently, so when functioning correctly, the thermostat acts to internally bypass a larger percentage of coolant to NOT go to the radiator for cooling when atmospheric temperatures are cooler. If the thermostat isn't closing correctly you may see over cooling during times of high air flow because too much coolant is being sent through the radiator instead of being bypassed.

Change the thermostat and see if that fixes it.
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Old 02-22-2015, 05:26 PM   #3
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It sounds like you have a partially bad thermostat. There's more cooling air going to the radiator at highway speeds making it decrease the temperature of the coolant more efficiently, so when functioning correctly, the thermostat acts to internally bypass a larger percentage of coolant to NOT go to the radiator for cooling when atmospheric temperatures are cooler. If the thermostat isn't closing correctly you may see over cooling during times of high air flow because too much coolant is being sent through the radiator instead of being bypassed.

Change the thermostat and see if that fixes it.
If I am not able to get to changing the thermostat for a while, is it bad to leave it the way it is? Is there harm that can be done with a stuck open thermostat?
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Old 02-22-2015, 08:00 PM   #4
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I'd just change it. Thermostats are like $20 and take 30min to change. Running too cool makes the car run too rich, continually in warmup mode and that means things like oil dilution/contamination and spark plug fouling and poor fuel economy, maybe eventually foul your cat, and not enough heat if it's cold outside. There's worse things for sure and you can run it like that, better to fix though.
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Old 02-26-2015, 07:42 PM   #5
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Thanks, I changed the t-stat and so far so good.
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Old 02-27-2015, 03:04 PM   #6
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Thanks, I changed the t-stat and so far so good.
Good, glad it's working out. Awesome that you posted back. Most new posters come here, as a question, then you never hear anything back
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Old 03-28-2015, 10:21 PM   #7
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+1 to this, did the same thing myself, turns out tstat was staying open, causing slow warm up and wouldn't reach temp on highway driving, tstats that stick open when they wear out are the best, problem identified and solved, glad everyone here is of help. good info as always
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