Causes Of Water On Floor Of Car Back Seat When Raining – How To Fix It!

Do you notice water on floor of car back seat when raining?

This may be worrisome for you to discover water on the backseat of your car when it rains. After all, it is not supposed to happen, since you have a roof shielding you from rain. So, why does this happen at all?

There are a few reasons why this may arise, and we will enumerate them for you! Find out the cause of this water buildup and what you can do about it. Let’s dive right into it. 

water on floor of car back seat when raining

Causes Of Water On Floor Of Car Back Seat When Raining

Your car’s back seat may be flooded with water for certain reasons. For example, your vehicle may have been parked in a location that floods. Or perhaps, it rained heavily and there is no good drainage for your car. Thus, water tends to pool in the back seat. Plus, if you have a sunroof and water leaks inside, it can get stuck in your back seat.

If a rainstorm has recently passed and you notice that your backseat is wet, it means that there is a problem that needs to be checked and solved right away. Here are among the reasons for water on floor of car back seat when raining.

1. Clogged sunroof drain tubes

One of the most common reasons why your car back seat may be wet when raining is due to a blockage to your sunroof drain tubes. The tubes carry water away from the sunroof. So, once these tubes are blocked, there is nowhere for the water to escape but in the car.

2. Improper sealing of the rear window.

When your back windows are not sealing well, rainwater tends to seep into the car and cause the backseat to get wet. If this is the case, there are a few things you can do to address this problem. Check if there is any foreign object that causes the window to get stuck. Debris or dirt may be preventing it from closing. But if the window is broken and does not seal well, you need to have a specialist fix it.

3. Condensation buildup

Another potential reason why there is water on floor of car back seat when raining is condensation buildup. It is possible that there is condensation building up on your back seat floor, especially if you have parked your vehicle in a humid location. Check if the floor is moist after rain, which could also be caused by leaks. Inspect your seals around the windows and doors to make sure there is no moisture seeping in from the outside.

4. Check for leaks.

If you end up finding a leak, it is best to have this issue repaired sooner than later. Otherwise, there is a risk of causing further issues to your vehicle. Some internal sources can also cause leaks such as cracks or holes on your sunroof, which allow water to get inside the car’s cabin.

Once you have confirmed a leak, you need to have this fixed by a specialist right away. But if there is no leak, it could only be due to a condensation buildup because of a humid environment. 

Should You Be Concerned?

The next question you may be having is whether water on floor of car back seat when raining is normal or not. If there is fluid leaking on the back seat, it is also possible that it may have come from the front. Perhaps, there is fluid leak from your differential, transmission, or brake system. Therefore, it needs to be checked by a mechanic for the right solution.

If the leak is caused by a blockage that is preventing the windows or doors to seal well, check what is causing that obstruction and clear it out. After clearing, test if there is no more clog by spraying water directly at the holes. Water should not pass freely inside, especially when you have closed your doors and windows.

It is also possible that the backseat floor has gotten wet because of your air conditioning system. There may be condensation building up when you fail to empty your cabin filter. This is to be done regularly since moisture may build up and lead to issues such as wet floors, musty smells, and reduced AC efficiency. So, make it a point to change the cabin filter based on your manufacturer’s recommendations.

If the passenger side floor of your vehicle is wet, it could be a leaky evaporator core. This component removes moisture from the air in your car. So, once there is a leak, there is nowhere for moisture to escape and gets trapped inside. Having leaks in your evaporator may also cause moisture to drip from your AC vents. 

Check if an evaporator core leak is the issue. Once confirmed, take your vehicle to the auto shop to get it fixed sooner than later.

What To Do Next

When you have determined the cause of water on floor of back seat when raining, the next step is to drain this water out. If you fail to do this, it may cause mildew and mold to develop inside your vehicle. This is why it is important to dry it out quickly.

1. Take out carpets or mats that tend to hold water and prevent the floor from drying.

2. Use your wet and dry vacuum and suck up moisture from your floor.

3. After sucking up as much water as you can, use a mop or a towel to absorb the rest of the moisture left.

4. If there is moisture in tight spaces, use your hair dryer and put on low heat to evaporate moisture quickly. Avoid high heat as it can melt plastic parts in your car.

5. When the area has dried up, sprinkle baking soda over the area and let this sit overnight. This helps to absorb more moisture. Then, vacuum it up the next day.

Read More: Water Coming Out Of The Exhaust: How To Find And Repair

Wrap Up

If there is water on floor of car back seat when raining, there are many reasons why this happens. The first step is in diagnosing the actual cause, resolving the issue, and drying the area properly to avoid mold or mildew infestation.

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