I've been trying to find the F and L marks (Full and Low) on the coolant
reservoir in my wife's '04 Sonata.  It's got the 2.7L in it.  I've looked
everywhere including on the tubing that extends down into the tank.  Damned
if I can see an F or an L.  The coolant is quite low in the tank so I
believe it needs a little refill but where in the hell do I find that F and
L mark?

I've even looked on the Hyundai web site at the service manuals and no luck
there.

TIA