![]() Combine that with the average consumers of their cars believing the whole "routine maintenance" idea was a scam, the coolant was destined to fail. The entire cooling system was full of cheap cut-corner gaskets and plastic water outlets, and very prone to cracking in a short time. The intake manifolds were plastic junk on most of them, with horrible gasket designs and materials that were eventually updated(Fel-pro redesigned the gaskets and offered a much better alternative to dealer gaskets for years before GM decided to do something about it). The real issue was the gaskets they used on their V-6's. GM had more problems than just with Dex-Cool. While they are far superior, funny things start happening to it when you mix other foreign additives and Ethelyn Glycol products with them, but what really kills them is contact with oxygen(opening up your antifreeze bottle regularly to check coolant or developing a leak) or running them for longer than the recommended service interval. Most old school OAT coolants and some Hybrid OAT coolants(HOATS) do not play nice with oxygen. Before you start boarding the "I hate Dex-Cool" train, there is something you may not know about Dex-cool. These coolants started debuting with the introduction of Dex-cool. Ok, so there are some new coolants emerging, known as O.A.T.(Organic Acid Technology). Try and clean it up then backflush your heater core and take your rad down for a good cleaning. ![]() Maybe a very mild mix of CLR and distilled water would help but everything it breaks loose has to go somewhere, which would be heater core/radiator. I am not sure a radiator flush is going to cut it here. If I were you I'd start figuring out what you wanna do to clean it out. Now seeing as how the head is that gunked up, I can only imagine what your radiator looks like. I think the OE stuff might have an anti-corrosive additive or something but I've seen people use pretty much everything and anything without a problem. GM's use DexCool (orange) but even then it's just a long-life antifreeze. You can run whatever antifreeze you want, personally I use Prestone if I am feeling picky but for everything else I work on I just buy the prediluted walmart stuff. But if you made that mess in 5K miles, there's something wrong here. Judging by the color, which looks sort of rusty IMHO, I'd say you had something leftover in the block. That looks like to me you had some sort of chemical in the coolant. You could use straight river water and it wouldn't do that.
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