Whenever I accelerate, I head a sloshing sound in my car. Anyone know what it could be?

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The sound may be coming from the evaporator drain line that is used for defrost and ac. It can get clogged with debris and will make a sloshing noise when you accelerate. It is a fairly easy fix, but you should do it before you drive the car around a lot.

Another possibility is that it is from air bubbles in the cooling system. This can happen when the coolant level gets low and the heater core has air in it. You can check the level of your coolant and also do some tests to see if this is the case.

You can also hear this if the rainwater collection system for the sunroof has been clogged. It has small drain holes on the bottom of the door that collect water when it rains, but they can easily become blocked with dirt and debris over time. If this is the case, you should check the drain holes in the bottom of the door and under the scuttle panel as well.

Whatever the reason, it is important that you address this problem right away. Left unattended, the presence of water in your car can lead to unwanted bacterial growth. This can cause a stale odor in the cabin and also can trigger allergic reactions in certain people. Taking the car to your mechanic will ensure that the problem is fixed correctly and promptly.