If you have water leaking into your car, it's a good possibility there is a simple fix. The first step is to find the point of entry, once you know where the water is entering the vehicle, you can start to plan the repair. If you have no idea where to start, I will point you in the right direction.
Problems With Automotive Water Leaks
A water leak can cause all kinds of problems from electrical issues, mold, rust, and fogged windows. If a water leak is not found and fixed quickly the most common problem is mold, mildew and a really bad smell. It may not seem like a big deal but mold spores can cause all kinds of health problems in kids and adults.
Where is the Water Coming From?
If you can find the point of entry (where the water is entering the vehicle) the battle is half won, and the only way to find the point of entry is to water test the vehicle with a garden hose on the outside of the vehicle while someone sits inside with a flashlight and looks for the water entering the vehicle.
I won't tell you it's easy to fix the leak once you find the point of entry because some leaks are hard to reach and require some disassembly of the vehicles interior. If you need to disassemble the interior body panels of your vehicle, you need to be a little mechanically inclined, if you need to remove the dash, I recommend you hire a professional.
Some Water Leaks are Caused by the Air Conditioner
Not all water leaks are cause by Mother Nature or a garden hose, some are cause by running the air conditioner in the vehicle. When the air conditioner is the likely cause of your water leak, the most common place to find water is the passengers front floor carpet.
The air conditioners evaporator is located just above the passengers feet under the dash, this is why the passengers floor carpet will get wet first, but once the car starts moving the water will find it's way into the back seat floor area as well.
The most common problem for water leaking from the air conditioners evaporator is a clogged evaporator drain. If you are running your vehicles air conditioner on a hot humid day for more then 20 minutes, you should see a puddle of water streaming from under your car, if you don't see any water draining, you may have a clogged evaporator drain.
The easy fix for a clogged evaporator drain is to run a coat hanger up the drain tube to dislodge the debris clogging the drain. Another way to fix this problem temporarily is to blow some compressed air up the drain to remove the debris, but it will return at some point.
The permanent fix is to remove the evaporator and clean out all the leaves, pine needles, and acorns, but this would take a professional mechanic who can discharge the freon from the air conditioning system and recharge it when the repair is finished.
But I'm Not Using MY Air Conditioner!
You may be thinking "but I'm not using my air conditioner", most newer vehicles (10 years new) use a function to automatically turn on the air conditioner when using the defrost mode in the climate control unit, this helps quickly clear any moisture from the windshield.
The air conditioner removes moisture from the air and the collection area is the evaporator, so keep that evaporator drain clear from any debris and your air conditioner will run more efficiently and you won't have any water dripping on the passengers floor.
Water Leak Video
I put together this short video on how to find a water leak, I hope it helps you find a fix your water leak.
If you have a water leak in your car, and you would like to ask a question on how to fix it, Please leave a comment and I'll answer it the best that I can.