Water Leaking Into Car Driver Side When It Rains – 11 Causes

Water Leaking Into Car Driver Side When It Rains – 11 Causes

Driving in rainy weather can be dangerous because rainwater can leak into the driver’s compartment through the windows.

This blog will discuss the causes of water leaking into the driver’s seat in an automobile and possible solutions to this problem.

Causes of car drivers side leaks when it rains

You must understand the cause of the leak before taking any action. It can save time and money by preventing unnecessary repairs.

Water Leaking Into Car Driver’s Side When It Rains – Causes

There are many reasons why water could leak into your vehicle’s driver’s cabin. Some of these include:

1. Cracked Window Wiper Blade

One possible reason water leaks into drivers’ side during rains is the cracked window wiper blade. A Cracked wiper blade may not wipe out all the water on the glass surface.

The water will drip onto the door panel or dashboard when this happens.

You can fix this problem yourself if you can replace a wiper blade. If you don’t know to fix it, then you need to take your vehicle to an auto repair shop for a replacement.

2. Damaged Window Washer Pump

A damaged window washer pump can prevent the proper flow of water from the reservoir tank to the nozzles.

It means that the water does not reach the window properly. As a result, the window drips water onto the floor of the driver’s cabin.

It is easy to fix a damaged window washer pump with only essential tools. However, if you don’t know how to fix it, you should bring your car to an auto mechanic.

3. Damaged window regulator

Damaged window regulators can cause water leakage into the driver’s side when it rains. Window regulators are usually located near the top of the window.

The most common way they get damaged is through poor maintenance. For example, the rubber gaskets that keep the window closed may dry up. It causes the window to stick open.

Other forces that can damage window regulators include hitting them against objects such as other windows or bumpers.

Window regulators can also become loose over time. Loose or damaged window regulators can cause water leakage into the driver’s cabin.

Fixing Damaged window regulators are easy. You need to remove the screw and unplug the wire connector. Then, you can install a new one.

4. Loose window switch

Loose window switches can cause water to leak into the driver’s side when it’s raining. The window switch is located inside the door frame, and it works by opening or closing the window.

The switch can get loose over time. If this happens, then it will not work correctly. As a result, water will leak into the cabin.

You can fix loose window switches by tightening the screws. If you don’t know how to fix them, you should contact an auto repair shop.

5. Clogged drain

A clogged drain is one of the most common reasons rainwater leaks into the driver’s compartment. The water will collect in the HVAC case if the drain is blocked.

When the air conditioner turns on, the trapped moisture will be forced out of the system.

To fix this clogged drain issue, you need to clear the drain. If you don’t have any idea about how to do this, then call an auto repair shop

6. Broken Windshield Washer Fluid Tank

A broken windshield washer is why water might be leaking into your car drivers’ side during rainy weather. It could happen due to a damaged seal on the tank itself.

You should check the condition of the windshield washer fluid reservoir every time you fill up the tank with fresh fluid.

Water leaking into car drivers side when it rains

If you notice that the windshield washer reservoir is leaking, you need to change the washer fluid—the easiest way to do it is by removing the air filter cover behind the dashboard, and then, you will see the tank.

Always check the windshield washer fluid level before changing it.

7. Loose Window Seal

A loose window seal is Another possible reason water leaks into the drivers’ side during the rainy season. It could happen because the rubber seals tend to dry out and crack over time.

It would be best to tighten the window seals whenever you get a chance. You should use a screwdriver to loosen the screws holding the window seals in place. Then, you should reattach the screws using the same tool.

8. Defective Rain Sensor

If the car has a defective rain sensor, it will cause water to leak into the driver’s side during rainy seasons. A faulty rain sensor could happen because of damage to the electrical connection between the rain sensor and the system.

It would help if you always kept the rain sensor clean and free of dirt and particles. If you find some particles stuck in the connector, you should remove them. Also, you should clean the rain sensor regularly as well.

9. Defective Window Motor Controller

A window motor controller regulates the opening and closing of the car’s windows.

Also, it controls the movement of the window glass through the operation of electric motors. The controller sends signals to the motors to open or close the windows.

Malfunctioned window motor controllers can cause rainwater to leak into the car driver’s side. It could happen because the wires connecting the window motor to the rest of the system are disconnected.

To fix this problem, you should first locate the faulty part. Once you’ve found it,  plug it back together again.

After that, you should test the circuit to ensure that everything works perfectly. If you cant fix it yourself, seek professional help.

10. Loose Window Glass

Loose window glass is another common reason water leaks into car drivers’ sides during the rainy season. The window glass does not seal tightly against the window frame. As a result, water gets trapped inside the vehicle.

It is important to note that you should always check whether the window glass is loose before driving if your car has an automatic transmission. It would be best if you also inspected the windows every year.

11. Faulty window caskets

Window caskets are used to hold the window glass in place. They are usually made from plastic or metal.

If water leaks into the driver’s side when it rains, check for a faulty window casket. Window caskets become defective due to poor quality, and they might be eroded over time.

It is advisable always to check the condition of the window caskets. If they look old and worn out, it would be best to replace them immediately to save yourself from future damages.


Water leakage is hazardous. It can lead to severe accidents. In most cases, water leaks occur because of the failure of the car’s components.

However, there are other reasons too. For instance, water may leak into the car’s driver’s side because of a damaged window.

You should never ignore these problems. Instead, it would help if you took immediate action to prevent further damage.