
The drain holes on the Buick Regal are located at the bottom of the doors, and there are also designs behind the front wheel arches of the doors. The purpose of the vehicle's drain holes is to allow accumulated water to drain out of the vehicle during rainy weather. During normal driving, if not cleaned in time, it can eventually lead to water entering the vehicle, and in severe cases, it may cause irreversible damage to the vehicle's mechanical components and electronic devices. Below are specific methods for maintaining the drain pipes: 1. Waterproofing: When driving in the rain or going to a car wash, be careful to prevent water from entering the muffler, which can cause rust and affect the use of the exhaust pipe. 2. Rust prevention: Remove the muffler, block the drain holes, add rust-proof oil, and evenly distribute it inside the cylinder before reinstalling the muffler. 3. Cleaning: The exhaust pipe is often exposed to the outside, similar to the interior of the car. Internal dirt can affect normal use, so it's important to clean the exhaust pipe regularly.

I've been driving a Buick Regal for several years, and the location of the drainage holes is something that really needs attention, because blockages can cause water accumulation leading to rust and damage. The door drainage holes are located at the bottom edge of each door, with small openings covered by rubber flaps to let water flow out when it rains. The sunroof has more drainage holes, usually at the corners around the sunroof or the front edge of the roof, with drain tubes leading to the underside of the car. There are also drainage holes under the hood, located in the rain tray below the windshield, where leaves tend to accumulate and cause blockages. For older Regal models, there might be additional drainage holes along the edges of the trunk lid or under the car. My lesson is to regularly check and clean them—just use a small wire or compressed air to clear any blockages—to prevent water from leaking inside, which can cause carpet mold or electrical issues. When parking, avoid areas with trees or debris buildup. It's a simple task but crucial for protecting the car's longevity. Always check these small holes during car washes or before and after the rainy season to ensure they're clear.

The drainage holes are designed to prevent water accumulation. The Regal has them distributed in several key areas. The holes at the bottom of the doors are for draining rainwater to avoid rust from water buildup inside the doors. The holes near the sunroof are located at the front edge or sides of the roof, directing rainwater outside. In the engine compartment, the drainage slots are under the windshield, where the holes are positioned. If present in the trunk, they are located at the rear edge. I once helped a friend clean clogged drainage holes and found that when leaves and mud got stuck, water could easily backflow into the car. Long-term neglect increases the risk of corrosion, especially if the sunroof holes are blocked, which can lead to water seeping in and soaking the carpet. Using a soft hose to blow air or gentle tools can clear debris. For routine maintenance, it’s recommended to spend a few minutes checking them monthly, especially during the rainy season or after parking outdoors, to ensure smooth drainage and peace of mind while driving.

The drainage holes of the Regal are mainly located in three areas: the bottom of the doors, around the sunroof, and the rain tray under the hood. The door holes are inside the small hole covers on the door edges; the sunroof holes are at the duct openings on the four corners of the roof; the hood holes are under the front windshield. These holes can easily get clogged with dust and dirt if not cleaned properly, leading to water leakage or rust inside the car. Simple maintenance can prevent major issues.


