Thanks Money Man
I've read that its 100+k miles or 5 years. But like I say it looks new and from reading quite a bit on the internet, many recommend leaving it alone as the possible introduction of air into the system (according to GM) when switching it out can cause Dex cool to sludge.
"According to internal GM documents, the ultimate culprit appears to be operating vehicles for long periods of time with low coolant levels. The low coolant is caused by pressure caps that fail in the open position. (The new caps and recovery bottles were introduced at the same time as DEX-COOL). This exposes hot engine components to air and vapors, causing corrosion and contamination of the coolant with iron oxide particles, which in turn can aggravate the pressure cap problem as contamination holds the caps open permanently."
In any case, my car only has 31k miles on it. By the looks of the overflow tank, air has not previously entered the system as it appears to be pink, like new.
The Cobalt is not set up to easily purge air out of the cooling system...that is why I'm considering leaving it as is. Maybe the coolant can somehow be tested to find out if it still meets specifications?
Anyone else have any input to my original question?
2006 LS. Automatic. 4 Door. 31k miles.
Last edited by 75greygremlin; 03-08-2016 at 05:15 PM.