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Same thing happened to me this winter at around 42,000 miles. I was getting onto the highway and then (I thought it was smoke at the time) coolant vapor started billowing out of the back of my car. Pulled over, shut the car off. I couldn't see any issues, so I drove the last couple miles to work. On the way, my heater started blowing cold air so I immediately knew the heater core was empty. Luckily the temperatures were freezing that day so my oil temp never spiked. I had the car towed to the dealer and they fixed the hose for around $279 (crazy price imo), but I did get a free courtesy car for a week. They said the hose was likely damaged by the shop that put the headers in my car, but I don't really believe that theory cause the hose doesn't run near the header.
Anyways if your oil temp spiked change it. Also monitor your coolant level to make sure you don't have a damaged head gasket or cracked head.
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