It doesnt overheat?
This is called digging yourself a very deep hole. Dont take the whole car apart because of a little gunk under the radiator cap.

Clean it off, drive a while, check for more gunk, rinse and repeat. If its not overheating, this is unnecessary, but more importantly, major explorative projects of this type tend to stall and result in a dead car sitting for a long time that you eventually dont want to even look at.

Just my 2 cents.

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