Renault Espace passenger heater

I have owned this car now for a whole year and I am very happy with it certainely the best Family car we ever had though now the there is no heating on the left inside passenger side nor the rear? the right works ok inc back and all dials and controle seem to work fine what could it be? I have pulled all the fuse in the fused box in engine compartement non of them are dead? now I have ask Renault but they will dismantle my car!!!!