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mysterious boom

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Ok, yesterday I was leaving the house and I got three or four houses down the road when I heard a boom and saw what looked to be steam coming from under the hood. The truck was all ready warmed up from a 3 hour drive home so I thought the radiator or hose busted, but there was no fluid on the ground and no obvious leaks when i opened the hood. I'm thinking it was a a/c hose. I didn't check and see if it still blows cold air still yet. How else can I check to see if there's any refrigerant still in the system or where find where the hose would be leaking?

Thanks guys.
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