A hose is damaged and throwing steam.
Since the vehicle is over ten years old, all the hoses could be at risk of blowing. A cooling system pressure test would show which hose is leaking. I would also recommend having the other hoses inspected during your next service. A certified mechanic, such as one from YourMechanic, can come to your home or office to diagnose the leaks and replace any hoses as necessary.
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