Chevrolet Blazer oil-like fluid accumulation in back driver side floorboard on Chevrolet Blazer

Some Chevrolet Blazer owners report experiencing oil-like fluid accumulation in the back driver side floorboard, which may indicate several potential issues. These owners have noted that the fluid could be caused by a bad head gasket, leading to a mixture of oil and coolant that results in a milky appearance and oily feel. Additionally, leaks from the heater core have been reported, causing coolant to leak into the passenger compartment from under the dash. Other possible sources include leaks from the third brake light seal, which can lead to water accumulation under the rear seats. To effectively identify the source of the leak, some owners recommend conducting a visual inspection, such as using a water hose on the vehicle to check for entry points. A thorough inspection is crucial for determining the exact cause of the fluid accumulation and preventing further damage.