![]() in some cases under 500 miles on a brand new vehicle. Coolant escapes, engines overheat and seize. For whatever reason, GM sold a bunch of Blazers and not quite so many of a few other models with radiator caps that could not hold a seal when under pressure. I don't know when GM started using DexCool, but when they started putting it in Chevy Blazers, they ended up with a bunch of unhappy customers with lots of problems. The issue wasn't really with the DexCool, it was with radiator caps. So why the bad wrap? Because people were overcooking it. And you can mix it with other traditional green coolants. I think I spent every night for two weeks reading blogs, articles, technical specs, testing results and legal briefs and I think I did a pretty good job of figuring out why DexCool got a bad rap, why GM still uses it, and what caution you need to take when using it.ÄexCool is actually a very good long life coolant - so long as you don't overcook it. After not finding it at a couple stores and then getting a concerned look and some advice from the guy at NAPA, I decided to look up DexCool on the web. Upon checking the manual, I discovered the light was telling me that the coolant in the coolant reservoir (overflow container) was low, and that the Saturn used DexCool which worked best when not mixed with any other form of coolant. ![]() Several months after buying the car, a strange light appeared on the dash, a rectangle with a wavy line and a large arrow pointing up. I thought I had done my research and that the car was pretty dependable (and time has proven it to be so). Several years ago, I purchased a slightly used Saturn for my wife (it was still covered by its original warranty).
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