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I purchased the tool from the Snap-on truck but the Ford dealer has them also. I dont know why the parts store doesnt have it but here is the tool number and how the tool works. It can be a pain but soon as the tool goes all the way into the line just pull on the line
Its like a A/C line with springs. You have to push the spring in so the line will disconnect.
You will have to get the tool or follow the line further down to see if there is a connection. Do not take the fitting off the radiator with the line as it will leak.