Wondering Why Your Car Makes a Sloshing Sound When It Turns a Corner?

Consumer Reports has no financial relationship with advertisers on this site.

Consumer Reports has no financial relationship with advertisers on this site.

The most common cause is a clogged drain trapping water in the heating and cooling system. The water, formed by condensation, usually empties onto the ground.

But a clogged drain can cause it to back up, leading to the sloshing sound and even dampness on the passenger-side floor.

The fix is usually quick and easy but best handled by a mechanic.

Most vehicles have several drain holes, including in the doors, trunk, and sunroof. When they become blocked, water can collect and cause damage, including corrosion. If the drains are clear, the cause could be the engine cooling system, which should be checked by a professional. 

For related car-maintenance information, watch our video on car maintenance myths.

Editor's Note: This article also appeared in the October 2019 issue of Consumer Reports magazine.



More from Consumer Reports:
Top pick tires for 2016
Best used cars for $25,000 and less
7 best mattresses for couples

Consumer Reports is an independent, nonprofit organization that works side by side with consumers to create a fairer, safer, and healthier world. CR does not endorse products or services, and does not accept advertising. Copyright © 2019, Consumer Reports, Inc.