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Coolant Surge Tank

9694 Views 5 Replies 6 Participants Last post by  928S
Anyone read the instructions for checking the coolant level? I must be missing the forest for the trees, but I cant figure out how its supposed to be done. The tank is black so you cant see any levels like you used to with the older white overflow tanks. You would have to open the tank up and then figure out the instructions:
The vehicle must be on a level surface. When your
engine is cold, the coolant level should be at the
FROID/FULL COLD line on the side of the surge tank.
Follow the arrow from the top of the tank down the
side to the horizontal mark
I dont expect problems plus with the Performance Collection you are supposed to have a heavy duty coolant system. Thus far I have never seen the temperature budge, even after driving hours at 95 plus degrees on I-95 last year and sitting still as usual. Just curious about how to check.
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I think they switched to a black plastic tank to avoid all of the complaints received when the fluid in the translucent tank turned a brownish color. There was nothing wrong due to the color but I bet it freaked allot of people out and caused unnecessary warranty claims...
Last year GM settled a class action lawsuit for damages caused by DEX-COOL® coolant, up to $800 cash to each class member. So let's hope that DEX-COOL® and engine components in our 2008-09 CTS's were designed to avoid any such damages.

"The lawsuits were filed on behalf of owners of General Motors vehicles, which were factory-filled with "Dex-Cool" coolant. In summary, the lawsuits alleged that Dex-Cool degraded certain vehicles’ intake manifold gaskets and other engine sealability components, and that in certain other vehicles, Dex-Cool formed a rusty sludge, clogging the vehicles’ cooling systems and causing vehicles to overheat." -
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