  Ultraviolet observations using the Solar Blind Channel on the Hubble Space
Telescope provide light curves and low resolution spectra of three pulsating
white dwarfs in the cataclysmic variables SDSS013132.39-090122.3,
SDSSJ161033.64-010223.3 and SDSSJ220553.98+115553.7. The UV light curves show
enhanced pulsation amplitudes over those from simultaneous and previous optical
photometry, while the UV-optical spectra are fit with white dwarf temperatures
near 15,000K. These temperatures place the accreting white dwarfs outside the
instability zone for non-interacting DAV white dwarfs and show that the
instability strip is complex for accreting white dwarfs.
