I guess that you will find the fluid in the cavity (at floor level) to the right of the rear passenger seat just behind the post that has the rear part of the sliding door.  You will have to remove the panel from the inside to see down in there.  I hope that I have made myself clear on the location of this cavity.
This cavity holds water and will RUST if you don't get it out and them put in some Rust-Check or Krown fluid (or some such).  m2cw   M

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From: Alistair Bell <albell@SHAW.CA>

all that fluid I was adding (2 fills) went  somewhere else.