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Keep in mind that the underfelt has a waterproof type layer on top ,so even when the carpet will feel dry the underfelt will be soaked and will begin stink, also could lead to rust in the floorpan . I used a heat gun to dry mine .Update.
The mechanic reckons he found the leak and has fixed it. He removed the glove box and LF passenger seat, pulled up the carpets on the passenger side, and sprayed water till he found it.
Was coming in around where the power cable (that runs from the red +ve jump point under the bonnet back to the battery in the boot) goes through the firewall, above the passenger side footwell.
Whatever GMH installed to stop water passing through this hole obviously failed after 10 years.
Water was trickling down from this hole, wetting the front passenger side carpets, and running along a channel in the floorpan on the passenger side to the rear, wetting that carpet as well.
What he found is consistent with what was getting wet.
Anyway, happy days and a dry car again.
(Touch wood)
That was a good find and I bet you are relieved it was a simple fix!
I found on ours the positive terminal on the interior side was not protected! The insulating cap was never put on properly.
It is above the pollen filterCheers.
I don't get which way Dayvo's picture is looking here with the leak he had.