What Causes Water Under the Rear Seat Car Mat?

2 Answers
StEmiliano
07/29/25 11:03pm
Water under the rear seat car mat may be caused by various reasons such as a leaking drain plug at the bottom of the car compartment, a leaking sunroof drain pipe, a leaking door, a leaking heater core (causing antifreeze leakage), a damaged or improperly installed air conditioning drain pipe, among other possibilities. There are multiple potential causes: sunroof leakage due to poor sealing—check the sunroof; water from car washing that wasn’t properly cleaned; or rust in the car’s small radiator (used for cabin heating), leading to leakage. To check if the sunroof drain pipe is clogged, fully open the sunroof to reveal a groove. Slowly pour water into this groove (the sunroof drain pipe) and observe whether the water drains properly or is blocked.
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MacJude
08/16/25 12:57am
Last time there was water under the rear seat floor mat in my car, and it turned out the sunroof drain was clogged. I poured a bucket of water on the roof, and it leaked into the cabin. Aging door seal strips are also a common cause—during heavy summer rains, water seeps in through the gaps. When checking, first remove the floor mat and use a flashlight to inspect the gaps for obvious signs. If there’s a lot of standing water, quickly soak it up with a towel to prevent damage to wiring or moldy carpets. Handling this yourself can be troublesome, so it’s best to visit a repair shop to clean the drainage pipes or replace the seals—it’s inexpensive, costing just around 100-200 yuan. Additionally, damaged door sills can also cause leaks, so pay attention to water stains during regular car washes to prevent issues early.
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