Why was there a sizzling sound coming from the passenger side of my car, and some water dripping onto the floor mat?

I have a 2000 Honda crv. The roof leaks a little when it rains on the passenger side when it rains, which it is raining, but the happens on the side where the wondow is. Yesterday I turned the heater on, and I heard a faint sizzling sound, and a little bit of water dripping onto the floor matt from under the dash board. Whats going on?

Why was there a sizzling sound coming from the passenger side of my car, and some water dripping onto the floor mat?
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