Recurring Flat Tire

[Fitzhugh]

The right rear tire on my 1992 Range Rover always goes flat. I've tried three different tires and two different wheels, with no success. Can anyone solve this mystery?

[Pat Fought]

have tire shop apply sealant to wheel (tire bead area)

[jp-]

My brother had this happen on a different car, the problem was the valve stems themselves. It seems that there were a rash of bad valve stems that went out a few years back.