Coolant? - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
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post #1 of 35 (permalink) Old 01-15-2010, 02:08 PM Thread Starter
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Coolant?

Anyone know what the coolant temp should be? It's usually been 190-196, but today I was sitting in line at the bank and I decided to check it. It was at 203 and kept going up. At one point it got to 214. When I started driving, it went down to 187? Is it time for a trip to the dealership? It's a 2008 Sport Coupe. would it still be under warranty at 45,000 miles?

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post #2 of 35 (permalink) Old 01-15-2010, 02:14 PM
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there is absolutely nothing wrong w/ the car, totally normal for the coolant temp to vary.

fan doesnt kick in till 230, so as long as ur under that ur good. mine varies betweeen 185-192. ive gotten all the way to 222 before, but i was doing a lot of heavy foot driving and it was over 100 outside.


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post #3 of 35 (permalink) Old 01-15-2010, 02:30 PM
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boiling point is 210 how can the temp be higher than that and not cause any problems?
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post #4 of 35 (permalink) Old 01-15-2010, 02:42 PM
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You should have a 50/50 misture of coolant to water,the coolant raises the boiling point or the 50 percent of water in the system to a higher temp.



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post #5 of 35 (permalink) Old 01-15-2010, 04:28 PM
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Quote:
Originally Posted by finnscobalt View Post
You should have a 50/50 misture of coolant to water,the coolant raises the boiling point or the 50 percent of water in the system to a higher temp.
Right. But still, I often wonder if the stat is opening up at say, 195 to cool in the rad, how is it possible to get to the 230 F which then, PCM kicks in??

Shouldnt the rad work well to cool back down to say, 190-210?
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post #6 of 35 (permalink) Old 01-15-2010, 04:57 PM
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i hit 205 when I dynoed, and like 205 before I tuned my car properly



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post #7 of 35 (permalink) Old 01-15-2010, 05:03 PM
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It heated up while you were idling because it wasn't getting airflow. Obviously idling for long periods in warmer ambient temperatures will drive coolant temperature up. If you're sitting for a while, just turn it off.


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post #8 of 35 (permalink) Old 01-15-2010, 05:33 PM
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if it gets up too high like 200, just flip on your a/c(can still use warm setting so you do not freeze your tush off) and that kicks the secondary fan on and well cool it back down to around normal. that is what I do if I am in traffic or stopped for abit.

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post #9 of 35 (permalink) Old 01-15-2010, 05:41 PM
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Also by putting in a lower gear and keeping in a lower gear while in stop and go traffic will keep RPMs up and increase the flow through the system and assist the cooling process.



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post #10 of 35 (permalink) Old 01-15-2010, 06:15 PM
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Quote:
Originally Posted by firigidice View Post
boiling point is 210 how can the temp be higher than that and not cause any problems?
OK HERE.....
Water does boil at 212 degrees, but
for every pound of pressure you put it under, then
the boiling point raises by three degrees.
So we have a 16 pound radiator cap X that by 3 = 48
Add that to 212+48 =260 so that is the boiling point under 16 LBS of pressure.

forgot I see 200- 215 often down here.

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