Check your expansion tank and make sure you have coolant. White is usually from burning coolant and you could have the making of a blown head gasket. If your coolant level is ok and you have cooled down then a short 30 km trip should be possible but the risk is up to you.

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"When the Team Chief said.... You're trapped in a hole with nothing but a goat and a slinky, what do you do? Stubby said, I'm not sure but it won't end well for the goat...." ~(Overheard) Last day, Phase 3, Q Course