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Swamp gas in my expansion tank????

Doug G.

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I am so paranoid about my cooling system after getting a new head that I have been checking the fluid level berfore and after every trip.

I have notices what looks to be what I describe as swamp gas lingering over the water in the expansion tank, what is it?

Its a new head so cant be exhause gases, had a sniff and could not detect anything so any ideas?

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