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post #1 of 14 (permalink) Old 01-14-2012, 06:20 PM Thread Starter
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Cold Weather Check Engine Light

The weather around here has been in the 30s for a little while now. The other night it was 16 degrees outside and as I was driving home, my check engine light came on. When I scanned it, it said that coolant temp was too low. I noticed that my coolant temp would stay around 160-170 when it's really cold ( 25 or less) and it's usually between 180-190 as long as it's over about 30 degrees outside. Is the change in coolant temp normal for really cold weather? I'm guessing the light came on because the engine computer is not used to seeing outside temps below 20 or 25. What temp does your 2.2 Cobalt run in really cold weather?
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post #2 of 14 (permalink) Old 01-14-2012, 06:48 PM
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Thermostat is design to keep engine at constant temperature no matter what the temperature is outside. So my guess is you need a new thermostat.

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post #3 of 14 (permalink) Old 01-14-2012, 07:30 PM
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Either thermo or you have the wrong coolant in. I'm in MN so mine sees bellow 0 from time to time and still runs at 190
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post #4 of 14 (permalink) Old 01-15-2012, 07:21 PM Thread Starter
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I'm running 50/50 Dexcool and water so I'm not worried about that. Guess I'll drive a while longer and see what happens.
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post #5 of 14 (permalink) Old 01-15-2012, 07:45 PM
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Quote:
Originally Posted by BigBirdL61 View Post
I'm running 50/50 Dexcool and water so I'm not worried about that. Guess I'll drive a while longer and see what happens.
it clearly states NOT to mix water with the dex-cool. Factory coolant is 100% dex-cool, states on the bottle "DO NOT ADD WATER". I believe it also says "gm certified" on the front (mine did)

I'm running the same coolant in my engine as in my heat-exchanger/intercooler setup and our temperatures reach well below zero (often below -30 degrees celcius) and no problems with it being too cold.

Also, as others mentioned your thermostat could also not be working right.

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post #6 of 14 (permalink) Old 01-15-2012, 11:22 PM
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with water????? bad idea check into that

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post #7 of 14 (permalink) Old 01-16-2012, 11:14 AM
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Probably want to swap the coolant and the thermo now.
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post #8 of 14 (permalink) Old 01-16-2012, 02:35 PM Thread Starter
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I didn't buy premixed coolant. I used Zerex brand Dexcool. I plan to replace the thermostat this week. I'll try to get back in here and let y'all know if it's fixed.
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post #9 of 14 (permalink) Old 01-16-2012, 04:59 PM
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FLush the system and get the water out of it... you're going to ruin your car.

Straight DEXCOOL ONLY... read your owners manual.
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post #10 of 14 (permalink) Old 01-16-2012, 06:52 PM
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^Correct. No water, just like you NEED to use straight synthetic oil with these cars. Sounds crazy but thats what you get when Opel is building your engine!
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