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boardpoisondartfrog put a very useful link
Look at the pictures. The last one, with coolant tank, is especially informative for Malibu owners.
There are tell-tale signs of rust (iron oxide) in the coolant system. The rust is very easy to see on the inside walls of coolant tank. A retired housewife can recognize it. With my car the sediment was more thick, and was also on the floor of the tank and even on its cap. Had it from the very day I bought the car used, one year old (from build date) and with only 15k miles.
The only problem is the rust have the same color as the orange DexCool coolant. The sediment looks natural.
My car had serviced by ASI certified mechanics, first at dealership, than at very good local Firestone shop. They added the coolant every 3 months, but never mentioned the rust. Probably even mechanics do not know this is rust, not natural...
tells that at least 3 types of the dark-brown sediments can be found in the coolant system filled by DEX-COOL. The rust (iron oxide), hose material, and sealant pellets. All of them are looking the same.
The rust is the worst, it can clog the radiator. If the rust is developing, the system needs in chemical flush. Fortunately for the Malibu owners, the 3.1l engine is not prone to the rust sediments. Only to the two other ones.
GM is also suggesting to overfill the system a bit. To fill it to the full (hot) mark with the cold engine.
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