409, 410 ventilation
Resurrecting an old thread...
One of my 410s had the same switch on the passenger side of the boot opening.
There was a Tannoy fan that extracted air through a second speaker grille on the parcel shelf and exhausted below the left side of the boot by the rear bumper.
The job was very nicely done and, having heard of other V8s with a similar modification, I wonder if this was a factory modification.
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