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aka Duke of URL
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4,815 Posts
If you think you have an exhaust leak (blown head gasket) into the cooling system, there is a special service tool made (Snap-On/MAC) that uses a chemical that is held in a bulb over the radiator opening while running that will change color when exposed to exhaust gas.

You may also perform a cooling system pressure check (both hot and cold) to see if there is pressure loss.

The only repair is to remove the heads, have them pressure checked and milled, and gasket replacement.
 
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