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The test is definitely for combustion gases in cooling system. The video that drove me there made the point that if it is leaking while at rest,...
My round trip is 80 miles, or if I let my wife drive the ticking time bomb, about 15 miles. No smoke or other signs present.
Short version: If the startup rattle / check engine light came on 3 drives ago, (i.e. I've started the car three times and driven it since the...