Decky, does the button have an 'A' beside one of the LEDs, on mine the 'A' LED is on the RHS...
there are three different modes to choose from,
1. Automatic Mode,
'A' LED lit, the car decides when to turn re-circ on & off ( 'arrow' LED turns on & off automatically to signify)
2. Manual Mode - re-circ on,
re-circ is permanently on ( 'A' LED off, 'arrow' LED on)
3. Manual Mode - re-circ off,
re-circ is permanently off (no LEDs lit)
I always leave mine in Auto, and usually only need to switch it on manually if I'm about to drive through a bad smell (smoke or some farmer spreading manure near-by)
pressing the Full 'Auto
' button on the passengers side will also set the Re-circulation to Auto Mode.
It's hard to explain in writing, and the manual doesn't help much, but the engineer in me needs to know how everything works, so I fiddled with it till I figured it out
I'm not great at explaining stuff so if you have any more questions just ask,