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Old 04-18-2018, 09:25 PM   #1
Zeebins
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1997 SL2
Default Gen 2 temp gage behaving like a gen 1

Recently I replaced my ects and shortly after I replaced my thermostat. I plugged in my scan tool to get actual numbers from the computer to make sure everything was working right. With the new thermostat + new ects, the gage hit the 1/2 mark around 200 degrees, which seemed fine to me. I did some searching to make sure this is correct and it seems to be, but for saturns made 95 and before. Didn't saturn alter the temp gage reading 96 and up so that 200 is alittle above 3/8 and 1/2 is about 212? I'm not really concerned that something is wrong, it doesn't really go much past that while driving so I assume the new thermostat is working correctly as it's a stant 195. I'm just wondering, is there a reason why the gage on my 97 would be behaving like the temp gage on a 95 or eariler? Are not all temp Gage's created equal?

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Old 04-18-2018, 09:48 PM   #2
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Default Re: Gen 2 temp gage behaving like a gen 1

Those ECT display systems (sensor, wiring, PCM, dash gauge) are hardly precision instruments. And, even high-cost precision stuff will never read exactly the same. Don't fret about it

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Old 04-20-2018, 06:35 AM   #3
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1995 SL1
Default Re: Gen 2 temp gage behaving like a gen 1

If you have the live data, just use your data to know your gauge on your car. People have been led to think that they are all the same, and they aren't. Truth wins over theory every time.

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Old 04-20-2018, 11:15 AM   #4
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1995 SC2
Default Re: Gen 2 temp gage behaving like a gen 1

There is also the well-posted suggestion of using a meat thermometer in the reservoir, to determine the actual coolant temperature.

As long as the wiring is not corroded
and the PCM is running fine, just make sure that your cooling fan is operational.

I don't recall the gauge calibration change, by year, but I can state after I did an engine swap on my Grand Am the gauge had different sending unit, ECTS, etc. So, changing the sensor can make a very slight difference(a few widths of the needle). Like Bill stated, these are not precision instruments by any means.

Now, my Grand Am gauge reads a needle width or two LOWER than what the old engine did. But, my fan still comes on when the needle gets to the 220F mark( mark on 1995-older GM divisions EXCEPT the Saturn S-Series).

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