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I'm becoming more convinced after reading many forums on the causes of antifreeze dripping from under the rad cap when it's not even hot yet. It's sounding like it might be from a bad head gasket or warped head. I just rebuilt the heads changing all the bent valves after a incorrect timing belt replacement job bent all of them. It ran great for about two weeks or more than the dripping started even when it wasn't hot.
Has anyone used any chemicals that are made for these leaks? One I heard is clear and has no solids, don't know if that works. And are these permanent enough as I'm planning a 6000 mile trip in August. Help please ! Joe
 

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Is there pressure in the system right after start-up?
 

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When it is cold take the rad coa off. Start her up and look for bubbles in the rad. If you see them its a good bet the leak is in head area.
 

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The fix you are referring to is a band-aid not a repair, especially if you are planning a trip of that distance. Not a fan of chemical fixes. Decades ago they used to repair engine blocks with a product called waterglass, and yes it worked, but back then you couldn't always just procure a new block so you did what you had to. I'd be checking out the heads and gaskets rather than chemical.
 
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