I have a 2011 Suzuki SX4 Crossover AWD with MT. Sometimes when I start it up, begin moving forward, or quickly decelerate I can hear what sounds like water (or some other liquid) moving from one place to another (can't quite tell where) under the dash or maybe just behind the firewall. I took it to the Suzuki service center (almost 2 hour drive from my home), and they told me that the A/C coolant was low. They refilled it and sent me on my way. However, I still hear the sloshing sound behind the dash. Does anyone have any ideas on what this might be? Thanks.
I've recently noticed that when this "running water" sound occurs that it is more prominent when the engine is running faster (e.g. during acceleration). This leads me to believe maybe this has something to do with the water pump, or some other liquid pump, that is run by the engine and not moving enough liquid to fill the pipe, hence a sloshing / running water sound.