What are the reasons for water ingress in the rear seat of the Regal?
2 Answers
Reasons for water ingress in the rear seat of the Regal: worn sealing strips, damaged trunk, etc. Here are the specific reasons: Worn sealing strips: Various parts of the vehicle body use sealing strips to ensure waterproofing. The sealing strips are made of rubber material, which has a certain degree of strength and hardness and does not deform under certain pressure conditions. However, long-term exposure to air can easily cause the sealing strips to age or wear out, ultimately leading to water ingress in the trunk. Damaged trunk: The design of the car's trunk follows certain rules, and typically, the body has corresponding drainage curvature designs in various areas. If the shape of the trunk is compromised, it can easily lead to severe water leakage when exposed to rain.
I've repaired numerous cases of water leakage in Buick Regal rear seats, and the common causes generally fall into these categories. Aged or cracked door seals are the prime suspect, as rainwater seeps through door gaps and gradually permeates beneath the floor mats. Clogged sunroof drain holes are also very common—accumulated leaves and dust can cause water to backflow into the headliner before dripping into the rear seat area. Additionally, deteriorated or improperly installed rear windshield seals are guaranteed trouble during heavy rain. If the chassis drain holes get blocked by mud or debris, accumulated water will seep into the rear seats from the trunk area. Another issue is a loose or clogged AC drain tube, which causes condensation to drain directly onto the floor. Upon discovering water ingress, first remove the accumulated water from the mats, then thoroughly dry them with a blower to prevent mold and odors.
