Emcee--Thank you for providing such welcome info for the rest of us! (Thank you also to Peace be the Journey!). I have had a mystery leak for YEARS in the cab on the driver's side. It causes the carpet under the brake pedal area to become wet, but even when raining heavily, it's nigh unto impossible to see where the drips are coming from. No one has been able to find the source and, like you, I ripped out the carpet so that at least it could air out when it rained. You mentioned a problem with a leaky grommet under the engine cowl. I am mechanically inept and need a bit more explanation of what/where that would be. Where do I look? I am hoping this solves my long-running, frustrating mystery.