Mercury Mariner driver's side water leak during heavy rain with slosh sound on passenger side on Mercury Mariner

Some Mercury Mariner owners report experiencing water leak issues during heavy rain, particularly when hearing sloshing sounds on the passenger side. These leaks may be attributed to several factors, including cracked window wiper blades that fail to properly wipe water off the glass, leading to drips onto the door panel or dashboard. Additionally, owners may find coolant or water pooling underneath the vehicle, with coolant often having a sweet smell and a distinct color. Leaks can also originate from the driver's side door seal or windshield, which can be tested by running a garden hose over that side of the car while inside. If water leaks are suspected, the interior trim panels may need to be removed for thorough leak testing. Moreover, clear water or antifreeze around the driver's side floorboard could indicate a coolant leak that requires immediate attention. Clogged drain holes can exacerbate water issues, allowing water to travel through the headliner, so cleaning these drains is advisable. Lastly, hose testing can help pinpoint leaks by directing water over the vehicle without directly exposing the door. Addressing these concerns promptly is essential to resolving water leak issues in the Mercury Mariner.