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post #1 of 16 (permalink) Old 12-07-2015, 10:05 PM Thread Starter
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Coolant Temperature Low?

Hey everyone,

I have a 2005 Cobalt 2.2L Base Coupe. Lately I've noticed that my coolant temperature has lingered between 167F and 178F while I'm driving around. Our outside temperature has been in the 30s and 40s. The car will reach 180F only if the car is sitting at idle. The thermostat was replaced 2 or 3 years ago.


What could be the issue?


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post #2 of 16 (permalink) Old 12-08-2015, 02:12 AM
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Your thermostat again.

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post #3 of 16 (permalink) Old 12-08-2015, 04:15 AM
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My ss runs at 170-180 in the 30s when driving. Sounds like everything is fine. When sitting it goes up to 180-190 right? If so I wouldn't worry.

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post #4 of 16 (permalink) Old 12-08-2015, 08:22 AM Thread Starter
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Driving to work today I drove 55MPH for 20 minutes and the coolant temperature stayed a steady 176F. The outside air temp was 35F.


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---------- Post added at 11:22 AM ---------- Previous post was at 11:12 AM ----------

The coolant would reach 180F when driving in city though.


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post #5 of 16 (permalink) Old 12-08-2015, 08:54 AM
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Thermostat is a 192F

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Drives 2016 Sunset Orange Trax LT1 1.4L Turbo auto 3GNCJPSB8GL142716

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post #6 of 16 (permalink) Old 12-08-2015, 09:50 AM Thread Starter
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I think mine is a 180F thermostat.

What brand should I get? I believe the one I have now is Ac Delco


Is there an instructional on how to replace? The last time is was replaced the mechanic said they had to shift over my header. But now I don't have a header in the car.


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post #7 of 16 (permalink) Old 12-08-2015, 10:39 AM
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Well if you have a 180 and it runs at 180 you're good.

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post #8 of 16 (permalink) Old 12-08-2015, 11:16 AM Thread Starter
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It only gets to 180F when I'm idling in this cold weather. But highway driving it doesn't. That's okay?


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post #9 of 16 (permalink) Old 12-08-2015, 12:02 PM
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Not okay if it doesn't produce enough heat to keep you warm or defrost the windows. Aside from that it won't hurt anything. If you start getting codes though I would change it. For the little power gains you get from running it 12F colder I would go back to the 192F thermostat unless you plan on moving to Florida.

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post #10 of 16 (permalink) Old 12-08-2015, 12:07 PM Thread Starter
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I looked on Rockauto.com and the oem recommended thermostat is 180F. That's why I'm a little confused.


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