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Discussion Starter #1
i bought an 06 cobalt ls a few months ago. my coolant temperature has never went over 192 degrees. i recently got in an accident where they replaced the radiator and did a few other front end things. the place had my car for 2 weeks gave it back and it was leaking transmission fluid, and overheating. took it back a 3rd time, its still overheating. my temperature will get over 200 degrees, sometimes in excess of 210. the coolant is full. the fan is not coming on.
the company said they brought it to a radiator mechanic and he said the fan is working correctly and it shouldn't come on until 210 degrees.

any ideas?
what are some of your typical coolant temperatures seen?

thanks much.
 

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mine usualyy sits at 189 to 192 sometimes gets higher when sittin in traffic...seems like the mechanics from whoever repaired it from the first place didnt do it correctly
 

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two quick possibilities first is check the coolant itself and make sure its orange. I know pretty much all new cars use the orange coolant but its worth a look. If the coolant is the old green kind that can cause some serious probs in a car thats supposed to have the orange coolant. the other possibility is a bit more of a pain in the butt. That would be air bubbles in the coolant. With sealed coolant systems filling up the coolant system is a real pain and there's lots of bleeding involved kinda like the brake system. If you have air bubbles in the coolant you'll get wild changes in the temp and overheating. just some ideas.
 

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It actually isnt all that hard to remove air bubbles if that is the case. Just carefully remove the radiator cap and turn the car on and then turn the defroster on full blast with the heat all the way up. That always works for us at my work.
 

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your fine, when i used to let my car sit in the driveway for a period of time running, it gets up to 220. i thought it was too hot but the dealer said that it was a normal temp considering the vehicle was stationary. but it should run on average from 189-192 during driving.
 

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Discussion Starter #7
thanks for the replys.
my car has been running between 190 - 200 when driving and standing still it gets up to 220 or so before the fan comes on. its just odd since before the accident it was steady at 190.
 
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Another possibilty is that the put a different temperature thermostat in when they changed the radiator fluid. The thermostat is what controls the fan, so it is something to look at as well.
 

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For what it is worth, in my experience, my cobalt seems to stay at a constant 194 when the AC is on. When the AC is off, the temp varies depending if the car is moving or standing still.
 

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The Cobalts run hot, like most new cars, mainly for emissions purposes. Don't worry unless you're hitting above 220-something. If you're really worried or are racing then get a colder thermostat, it will open sooner to keep the motor cooler especially if you do any kind of drag racing or hot lapping at a local track.
 
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