Hi, I had this. Basically under your sill are about 6 plastic bungs. They are blocked. They need taking out and cleaning. Water, whether it be rain, and road water will track through voids in your cars bodywork and needs to escape through these plastic bungs, but over time dirt deposits in the water block them up, hence why your rear carpet gets wet.
Astra Sri 60 plate (LEAK REAR FOOTWELL
in Vauxhall Owners Lounge
Posted
Hi, I had this. Basically under your sill are about 6 plastic bungs. They are blocked. They need taking out and cleaning. Water, whether it be rain, and road water will track through voids in your cars bodywork and needs to escape through these plastic bungs, but over time dirt deposits in the water block them up, hence why your rear carpet gets wet.