Reasons Your Car Could Be Leaking

Have you ever experienced a scenario where you spot a pool of water near your vehicle and wonder about its origin? Identifying the source of the car could be leaking can be a challenging task, but it’s essential to address the issue promptly to prevent any harm to the car’s interior and sensor components. When water accumulates in the car, it can damage the electrical system and lead to long-term problems such as mold growth on the upholstery and mats. Besides puddles of water, water droplets on the windows, windshield, or inside the vehicle can also indicate water leakage. There are various reasons for water leaks, and each has its symptoms and solutions. Let’s delve into the most common factors responsible for water leaks in cars.

  • When there is a problem with the air conditioning system, water leakage may happen because of the drain hose getting clogged. If the water is dripping only when the AC system is being used, the issue is probably caused by some blockage in the air conditioning system. It is important to address this problem to prevent further damage to the system.
  • The windshield wiper system is a frequent source of water leakage in vehicles. Although the system is generally sturdy and not prone to leaks or harm inside the car, external factors or system quality may sometimes cause internal issues. These problems can lead to damage in the internal connections of the windshield washer system, resulting in water seepage into the vehicle if they continue.
  • For cars with sunroofs, it is possible that water can leak into the interior due to clogged or damaged drains. These drains are installed to prevent such leaks. To resolve this issue, it is important to carefully examine the sunroof drainage system and ensure that it is not obstructed or contaminated.
  • If the latches or hinges of a vehicle are faulty, they may result in water leaks inside the car. Identifying the specific hinges or leakages responsible for the issue can help in resolving it easily. It is important to address any damage to the hinges to prevent water leaks.
  • It is possible to observe water pooling under a car on a sunny day due to faulty A/C evaporator coils. This is because the A/C system eliminates warm air from the cabin and produces cool air as you drive. Dirt on the road can obstruct the evaporator drain, resulting in condensation being trapped. As a result, moisture accumulates within the car and can saturate the floor over time.
  • The lining of car doors includes rubber seals which can become damaged over time from friction caused by opening and closing the door. This damage can result in water entering the car through the door. It is important to regularly check the condition of these seals and adhesives, as they are not meant to last indefinitely. If the seals are worn or the adhesives are faulty, they should be replaced without delay to prevent any leaks.
  • Header tank overfilling problems; if you notice that the header tank is overfilled, the next thing to do is to get rid of this fluid and understand how much exactly it should be inside it to avoid future water leaking inside your car.

When identifying car leaks, it is important to consider fluids other than water, and color can be a helpful indicator in determining the source of the leak. A guide based on color can be used to assist in this process.


  • Dark Brown – Old engine oil or brake fluid
  • Light Brown – Newer engine oil or gear lubricant

Warm Color

  • Red – Power steering or transmission fluid
  • Orange – Transmission fluid or radiator coolant
  • Pink – Power steering or transmission fluid
  • Yellow – Radiator coolant

Cool Color

  • Green – Antifreeze from a water pump, hoses, radiator, and windshield wiper fluid
  • Blue – Windshield wiper fluid

By utilizing this guide, you can promptly identify the source of the leak and explore potential remedies for the issue without any missing or overlooked details.


Although the article has listed some reasons for car could be leaking, there may be additional causes that are not mentioned. It can be quite frustrating to deal with car leakage, particularly when the root cause is unknown. Neglecting the issue could result in more severe problems and higher repair costs. If you have exhausted all possible reasons and are still unable to identify the cause, it is advisable to seek the assistance of an auto mechanic. K & M tire & Auto offers a range of auto services, including engine diagnostics and maintenance services to cater to your needs.