How to Solve Water Accumulation in the Spare Tire Compartment of a Corolla?

[EvangelineLynn]

There is a rubber drain plug at the bottom of the trunk where the spare tire is placed; removing it will allow the water to drain. Locate the source of the leak. Check if the trunk lid is deformed.

[VanLincoln]

I recently encountered this issue as well, and my friend's old Corolla had the same problem. Water accumulation in the spare tire well is mostly caused by a sealing issue at the rear of the car. First, remove the accumulated water by soaking it up with a towel or using a vacuum cleaner. Pay special attention to checking the trunk drainage holes—blockages from leaves or debris can prevent water from draining. If the rubber seals are aged or cracked, they should be replaced promptly, especially around the license plate light area, which is most prone to water seepage. Last time during a repair, the mechanic reminded me that improper repairs after a rear-end collision could also lead to leaks through gaps in the rear panel. After cleaning, you can perform a water spray test—have a friend spray water from the outside while you observe for leaks inside. Finally, remember to check the tools stored in the spare tire well, as prolonged exposure to water can cause rust. It's best to remove them and thoroughly dry out the interior of the trunk.