- :
- 2018 CX-5 Sport
I heard a noise like a party horn, but quieter today, twice. It was a warm humid day and I had the AC on and was parked. I heard this horn noise that was loud enough to make me look out the window for a kid making noise. I drove off and when I was at a stop light I heard it again. I sort of think maybe it was water going through the drain tube and reverberating, like when you blow through a straw with the other end of the straw pinched. Has anyone else heard a horn like sound when your AC was on? I'm not worried about it, just curious what caused it.