What causes the sound of water sloshing inside the Tiguan?

[DeElisa]

Hearing the sound of water sloshing is generally caused by the movement of gasoline, antifreeze, windshield washer fluid, or other accumulated water. Possible causes include low levels of fuel in the tank, insufficient antifreeze or windshield washer fluid, air trapped in the heater core that needs bleeding, or a faulty heater valve. 1. Low fuel, antifreeze, or windshield washer fluid: To troubleshoot, first refill these fluids. If the sound comes from the front of the car, top up the antifreeze and windshield washer fluid. If it comes from the rear, refuel the car. 2. Water accumulation: Check for water in the doors, side rails, evaporator, or exhaust pipe. 3. Air in the heater core needing bleeding or a faulty heater valve: If the sound occurs when the AC is on but stops when it's off, this is likely the cause.