Ok you have an S4 right? If so you could have the heater hose that goes under the intake manifold that is hard to see much less get to. That could have busted. Also on FC's look on the driver's side for the heater hose. Run's near the oil filter. That one is famous for breaking since when you change the oil you will get some on it. I tend to replace them every two years or so just because.
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