Chevrolet Avalanche 1500 persistent wet floor issue since purchase on Chevrolet Avalanche 1500

Submitted by Vehicle Owner · Jun 23, 2025
Published by RepairPal

Problem overview

Some Chevrolet Avalanche 1500 owners report experiencing persistent wet floor issues, which may stem from several potential causes. One common issue is a cowl leak, allowing water to enter the vehicle and saturate the floor. Additionally, some owners have identified a leaking heater core as a possible culprit, particularly if a distinctive antifreeze smell is present, typically affecting the passenger's side. Another concern is a blocked A/C drain tube, which can lead to water accumulation inside the vehicle when the air conditioning is in use. Owners should also consider external water entry points, such as leaks from windows, doors, or sunroof seals, and ensure proper sealing and drainage in these areas. Lastly, gutter overflow during heavy rainfall can cause water to seep onto the carpet, highlighting the need for adequate drainage and sealing. To effectively address these issues, it is crucial for owners to systematically inspect these potential causes and take prompt action to prevent further damage and maintain a dry, comfortable vehicle.

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