My wife say sshe sees a message saying coolant 71%on my sons 2009 cobalt is she still able to drive it?

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It is a well known issue

the infamous power steering message... - Cobalt SS Network

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Apr 15, 2017 - Problems/Service/Maintenance - the infamous power steering message... - as the title says, i am losing power steering and getting the message on the dash.
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Power Steering Warning/ Trans. Won't Shift

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reset a drive cycle no such thing =

Here's a link James,stroll down and you will see a picture of it at the engine and how to remove. Code P0010 P011 Easy Fix Chevy Cobalt Forum Cobalt Reviews Cobalt SS...

Transmissions are electronically controlled. If you put it in drive and it acts up it is because of transmission failure. It could be electronically or mechanically. Since you have an 09, I would guess it is electrical, unless you have had a transmission leak.

This is normal, all it is saying is that with the outside temp.there may be ice on the roads. this is just a warning message letting you know it may be slippery on the roads. you will see this message go away when the outside temp rises above freezing. hope this is helpful, good day

As far as the cobalt, check tac/throttle actuator control. Below is circuit description for p1682.
The other codes was for knock sensor.

It could be a fuse.
Do you know there's a brightness adjustment somewhere on the dash. That also could be it. :-)

Doese it go away after you shut it off and after a few miles come on..? If so it is a built in service reminder to have the fluid changed. I have seen this on most Z 71 trucks. Stop buy you local parts place and have the check the code to be sure.....

Take it back to your dealer , you have a problem with the heater core.