Check and clean the drainage holes: Firstly, it is necessary to check whether the drainage holes at the bottom of the car door are blocked. If the drainage hole is blocked by dust, mud, asphalt or other substances, it will cause water accumulation in the car door. You can use a screwdriver or other tool to clean the drainage hole to ensure that water can be smoothly drained.

Use a hair dryer: If there is water accumulation inside the car door, you can use a hair dryer to blow away the water and quickly evaporate it. This is a fast and effective method, but safety precautions should be taken to avoid overheating or electric shock of the hair dryer.

Check the waterproof membrane: If the car door leaks water, it may be due to damage to the waterproof membrane behind the door. Need to dismantle the car door and check if the waterproof film is intact. If the waterproof membrane is found to be damaged, it can be repaired with snake glue and the waterproof membrane and accessories can be reinstalled.

Use warm water and antifreeze glass water: In extreme cold weather, car doors may freeze. You can pour warm water (note that the water temperature should not be too high to avoid damaging the car paint) into the gap of the car door, or spray antifreeze glass water with a low freezing point onto the edge of the car door and the lock block position to help thaw 45 degrees.

Professional inspection and maintenance: If the above methods cannot solve the problem, it is recommended to directly contact the 4S store or professional maintenance personnel for detailed inspection and maintenance to avoid water ingress causing circuit short circuits or other damages.