Percolation? Heat soak? Don't drive during summer??

69_340_GTS said

I think that's a little dangerous. How many people have had engine blocks or heads crack because that plain water froze? Yeah, maybe where you live it won't ever get that cold. But freakish stuff happens all the time.

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Don't think anyone was suggesting it, just pointing out that adding more glycol to his weak mix probably won't result in better cooling.

Luckily, fixing the coolant ratio is also not likely to hurt his cooling performance much since the car seems to run at the right temp on the highway.