Why is My Car Leaking Water? The Surprising Reasons

You drive to the market to pick up something quickly, but when you back out of the parking spot, you notice a wet spot on the ground.

After a closer inspection, you realize that it is water leaking from the vehicle, not something more troublesome, but you still wonder "Why is my car leaking water?"

I have been in this scenario, and I was worried that the leak was a real issue. I created this guide so that you don't need to worry about your vehicle leaking water.

There is actually a rather simple explanation, so let's take a look.

Confirm It's Water


When you notice a leak under your car, the first thing that you should do is confirm that it is indeed water that is leaking.

Check out these tips to help you determine what to do if the fluid is something other than water.

Typically, there are six different car types of fluids that can leak from your car. If the fluid is water, then it is most likely one of two different reasons.

Why Is My Car Leaking Water?

The first reason that your car may be leaking water is because the exhaust is leaking.

As the fuel in your vehicle combusts, it leaves behind a small bit of moisture that will drop off of the tail pipe. This is the source; the water will clearly be located under the tailpipe. This condensation is not a reason for concern.

The other reason that you might see water leaking from your car is that your car's air conditioning unit is causing a water leak. When the air outside is hot and humid, the air that is circulated through your car has moisture in it.


This moisture is removed as the car is cooled down, and the water is drained through a hose that leads to the underside of the car. The hose is located on the front right side of the car, so if you see water leaking from there, the air conditioner is most likely the cause.

On excessively humid days, the moisture that is collected as it is circulated through the cab of the car will drain out of the hose much faster than it would on a day that is not hot and humid.

This will happen until the majority of the moisture has been removed from the car. Check out this video to see where the leak will occur.

With some of the larger vehicles that have a front and a back air conditioning system, you may notice that this type of leak can occur in the back of the vehicle as well.

These leaks are harmless, and the vehicles are actually designed to drain the moisture in the air as you cool off on a humid day. Once the moisture is gone, the leaking will slow down.

How To Stop The Water Leak?

When you drive your car with the fresh air feature engaged on the air conditioning unit in humid, hot, or foggy weather, it is possible that the air coming through the vents is simply causing the vehicle to leak more water.

Of course, the water in the air is being evaporated as it goes through the air conditioning system, but it is also being re-moisturized as the air from outside of the vehicle combines with the air in the car.


In fact, when the moisture in the air is extremely high, you can actually see that moisture form on the windows.

In most situations, this moisture is located at the base of the front window near the location of the vents, but it can also be seen on the side windows as well. 

The only way to stop the fog from hindering your view as you drive is to turn the vents on to re-circulation mode.

When you put the air circulation system into this mode, the moisture in the air will decrease with each pass it makes through the system.

Instead of continuously bringing fresh air in from the outside that has more moisture in it, this method will re-circulate the air that is already in the car.

The moisture will be removed more effectively, and the air inside the car will feel cooler because it is functioning in a more efficient mode.

Once the car reaches the optimum temperature based on the settings of the air conditioner, you will notice that the water leak has slowed significantly; in fact, it will stop when all of the moisture is removed from the air inside the cabin of the vehicle.

Additional Concerns

If you find that the passenger carpet is getting wet on occasion, then the air conditioner drain may be clogged or broken in some way. The best way to ensure that this issue is fixed is to clean out the rubber drain hose.

  • First, try to blow loose debris out with compressed air, but if that does not work.
  • Then you may have to remove the tube from the evaporator to remove the debris.
  • Check out this diagram so that you know where the tube is located.

Final Thoughts

As you can see from this guide, a water leak is not something that you need to be concerned about in your vehicle. When you notice a leak, the most important thing to do is to confirm what is leaking. Water may not be a concern, but oil and other fluid may be.

Once you know that the leak is water, place your car's air conditioner on re-circulation mode to minimize the humidity. After the humidity is gone from the car's cabin, the leak will subside.

Hopefully, this guide has helped put your fears about your car's water leak to rest.

If you have any questions or concerns, feel free to leave a comment, and I will get back to you as soon as I can with a response.

Christina Powell

Hi everyone, My name is Christina Powell, chief editor at Wheel On Road. I have a passion for car when I was young. I Started this blog with my team and we share to people everything about automotive, car like how to drive car carefully, maintain a car and many other topics. Hope you will also share and track us. If you have any problem, you can contact us at: Christina.WheelOnRoad@gmail.com

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