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Gas outflows are believed to play a pivotal role in shaping galaxies, as theyregulate both star formation and black hole growth. Despite their ubiquitouspresence, the origin and the acceleration mechanism of such powerful andextended winds is not yet understood. Direct observations of the cold gascomponent in objects with detected outflows at other wavelengths are needed toassess the impact of the outflow on the host galaxy interstellar medium (ISM).We observed with the Plateau de Bure Interferometer an obscured quasar atz~1.5, XID2028, for which the presence of an ionised outflow has beenunambiguously signalled by NIR spectroscopy. The detection of CO(3-2) emissionin this source allows us to infer the molecular gas content and compare it tothe ISM mass derived from the dust emission. We then analyze the results in thecontext of recent insights on scaling relations, which describe the gas contentof the overall population of star-forming galaxies at a similar redshifts. TheStar formation efficiency (~100) and gas mass (M_gas=2.1-9.5x10^{10} M_sun)inferred from the CO(3-2) line depend on the underlying assumptions on theexcitation of the transition and the CO-to-H2 conversion factor. However, thecombination of this information and the ISM mass estimated from the dust masssuggests that the ISM/gas content of XID2028 is significantly lower thanexpected for its observed M$_\star$, sSFR and redshift, based on the mostup-to-date calibrations (with gas fraction <20% and depletion time scale <340Myr). Overall, the constraints we obtain from the far infrared and millimeterdata suggest that we are observing QSO feedback able to remove the gas from thehost

Evidence for feedback in action from the molecular gas content in the z~1.6 outflowing QSO XID2028