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I'll also like to hear more about the dye trick. Where was the dye showing up?
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It's not a trick. It's a diagnostic tool. A little pricey, but if you're unsure of a blown head gasket it's a money/time saver.
A solution (dye) is added to your coolant. The engine is run for a few minutes to circulate the solution throughout the engines coolant passageways. The "tester" extracts a sample of the coolant and tests it. I've forgotten the exact means, but the tester determines if the head gasket is blown.
It's similar to the old "anti-freeze percentage" tool that can tell you what percentage of your coolant mixture is anti-freeze, but a little more high-tech.
I think the kit is around $40.
