What to Do if Your Car is Leaking Water From Under? (5 Main Reasons)

In this article, we will explain the condition “My car is leaking water from the bottom.” The water leaking from the bottom of the car can be due to several reasons. Hence, it becomes necessary to know the different reasons behind the water leaking from the bottom of the vehicle.

When you observe a fluid coming out from the bottom of your vehicle, you want to resolve the issue as quickly as possible. There are different kinds of fluid in the car, ensuring that the car is run properly. Thus, when a fluid is leaking from the bottom of the vehicle, you need to make sure that the fluid is water and not any other substance.

Because if the water is leaking from the bottom of the vehicle, it is mainly due to the vehicle’s air conditioning system. Moreover, even if excess water is being leaked from the bottom of the vehicle, then it can be easily controlled. We will explain the common causes of water leakages inside or outside the car in the coming.

Why is my car leaking water from the bottom?

The reasons why the car is leaking water are as follows:-

  • Water leak due to air conditioning system
  • Water leaking from the exhaust
  • The Cooling System
  • Windscreen washer fluid
  • Physical Damage

Water leak due to air conditioning system

One of the common reasons behind the water leaking from the bottom of the vehicle is the air conditioning system. We may notice the car A/C is leaking water on the floor or leading water in another location. However, the main reason behind the car A/C leaking water can be the accumulation of moisture in the air conditioning unit’s parts. That accumulated moisture drips down the area present near the rear of the engine.

However, sometimes you will find that water starts dripping inside the car in addition to the exterior leaks because of the air conditioning system. The main reason behind this is the drain tubes getting blocked in the air conditioning system. Thus, the condensation will pool in the A/C box in such a case. This moisture collection will create a musty smell and help you identify that the car is leaking water under the passenger side floor. You need to remove the blockage in the drain tube to fix the problem.

  Water leaking from the exhaust

Another reason behind the water leaking from the car is the exhaust. The fuel combustion takes place in the engine. Thus, a small amount of water may be propelled out of the exhaust pipe due to the combustion process. This condition is completely normal, and there is nothing to worry about. 

However, you need to keep one thing in mind when water is dripping out from the exhaust pipe. Make sure that the fluid coming out from the tailpipe is not coolant. 

The Cooling System

When your car is parked, you may notice that water leaks out from the bottom of the vehicle. This might be due to the issue in the vehicle’s cooling system. Thus, when fluid leaks from the vehicle, make sure that the fluid is water and not coolant. 

Because if coolant is leaking from under the body of the vehicle, then there might be a condition where the cooling system component such as the radiator, coolant pipes, etc., are damaged. Therefore, you need to get the pipes and radiator replaced in such a situation.

Windscreen washer fluid

The windscreen washer fluid is present in a tank situated inside the vehicle’s fender. The tank contains a mixture of water and soap. Thus, there are chances that the windscreen washer fluid tank gets damaged, and a leak starts to happen. Moreover, the leaking of windscreen washer fluid can also be due to the leakages in the pipe, which takes the windscreen washer fluid from the tank to the windscreen.

Physical Damage

If you observe that water is leaking from your car during rains, you might be dealing with the physical damage that is causing the water inside the vehicle. In such a situation, you must figure out the water leaking inside when it rains because it would have come inside from an external source. Thus, you need to fix the body of the vehicle to get rid of the water leaking due to physical damage.


This article addressed the “My car is leaking water from the bottom” situation. To explain the water leaking from under the vehicle, we have explained the different causes behind the water dripping from under the vehicle. Moreover, we have also explained how to fix the problem. 

Frequently Asked Questions(FAQs): My car is leaking water from the bottom

Is it bad that your car is leaking water?

A few drops of water leaking from underneath the car are normal. Because when it is hot and humid, and the A/C is on full blast, the cooling system is working harder, and hence the chances of a water leak are more.

Why is my car losing water but not overheating?

The chances of such a condition can be due to the leaking of coolant from the radiator cap, internal coolant leak, and external coolant leak. Thus the longer you wait, the higher the cost of repairs.

Why would the floor of my car be wet?

The A/C evaporator draws warm, humid air out of the cabin and allows water vapour to drain out onto the road when you drive. However, if the drain in which the A/C water is collected is clogged, water will flow into the cabin, forming small puddles.

What are the signs of a blown head gasket?

The sign of a blown head gasket are:-

  • White smoke from the tailpipe
  • Bubbling in the radiator and coolant reservoir
  • Coolant loss
  • Milky white colouration of oil.
  • Engine Overheating


  1. https://www.cashcarsbuyer.com/car-leaking-water/
  2. https://www.goldeagle.com/tips-tools/what-is-leaking-under-my-car/