Re: Nasty coolant. Bad head gasket?
You'll know if a head is leaking into your coolant passages. One of the things you'll notice is if you crank your engine with the radiator cap off, it can spew water like a geyser. However, if it just slight leakage, you'll see bubbles forming in the radiator neck. Also, your radiator and heater core will over pressurize and could begin to leak. You may blow a radiator hose off.
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