Q: white steam or smoke

asked by on December 19, 2016

Driving the car and notice white steam or white smoke coming from the hood of the car. I was in the line I had the heat on in the car on high while I notice the temperature gauge come on. Then I parked and let the car cool and everything I had coolant in the resvoir for coolant it said full. Then I got back in the car and turn the car back on it ran fine without me turning the air on? what could be the problem?

My car has 190000 miles.
My car has an automatic transmission.

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