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Sounds like a bad head gasket - actually almost certainly! One way to test..have someone with an emissions tester stick it in your radiator...if it registers emmissions gasses present..well the main way it would get there is through a bad head gasket. The gunk is probably coagulated exhaust. Also I'll bet your either getting light white smoke or water coming out the exhaust.

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โˆ™ 2006-04-15 22:07:05
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Q: You replaced your radiator 1 yr ago now your blazer is over heating again and theres all this gunk on the cap it looks like they did'nt flush it very good you keep adding fluid but its going somwhere?
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