Posted by Steve@Advance on February 28, 2018 at 20:53:54 from (66.169.147.211):
In Reply to: Re: Radiator overflow posted by Roland34 on February 28, 2018 at 17:44:40:
Overflowing in 5 minutes is a symptom of a head gasket or cracked head.
What's happening is combustion pressure is entering the cooling system, building pressure and pushing the coolant out. That in turn creates a steam pocket in top of the head, causing more overheating.
Why it does it sometimes and not others, probably because the problem is in the beginning stages. Chances are it will progress.
One thing you can do, with the system under pressure, pull the spark plugs, let it sit overnight. Hit the starter and watch for water vapor to blow out a cylinder. If that happens, for sure a gasket/head problem, but sometimes they pass the test and still have a problem.
There is a combustion leak test that will give trusted results. It is a chemical that changes color if combustion gas is detected. You may be able to borrow one from a shop, a little expensive for a one time buy.
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