If you've got an blown head gasket then no it's not okay because you might end up stranded in the middle of nowhere. If you are having overheating problems I suggest that you don't drive it long distances especially 4 hours away. I'd be best to get the problem fixed first. Drive a different car if possible. You might end up having to chuck up more money in the end by warping your head and block due to constant overheating and cooling.
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