Air diffuser for a vehicle, where the air diffuser comprises a casing, where the casing defines: - an air inlet opening, - an air outlet opening, and - a cavity, where the cavity is arranged between the inlet opening and the outlet opening, where the casing comprises a first wall and a second wall, where the first wall is facing the second wall, where the first wall and the second wall define a narrowing of the cavity to the outlet opening, where the first wall comprises a bottom edge and where the second wall comprises a top edge, where the top edge and bottom edge define the outlet opening, where the air diffuser comprises a guiding means arranged in the cavity, where the guiding means comprises a first end close to the outlet opening, the guiding means being displaceable between: - a first position, where the first end is arranged adjacent to the second wall, where the first end is configured to remain facing the top edge, with the guiding means being displaced in the first position, and - a second position, where the first end is arranged adjacent to the first wall, and where the first end is configured to remain facing the bottom edge, with the guiding means being displaced in the second position, and where the casing comprises at least one guide, where the at least one guide defines a displacement of the guiding means between the first position and the second position, the displacement of the guiding means comprising a third position, where the third position is intermediate between the first position and the second position, characterised in that the first end of the guiding means is far from the outlet opening with the guiding means being displaced in this third position, with the guiding means being displaced in the first position, the first end is arranged flush with the top edge, and with the guiding means being displaced in the second position, the first end is arranged flush with the bottom edge. - an air inlet opening, - an air outlet opening, and - a cavity, where the cavity is arranged between the inlet opening and the outlet opening, - a first position, where the first end is arranged adjacent to the second wall, where the first end is configured to remain facing the top edge, with the guiding means being displaced in the first position, and - a second position, where the first end is arranged adjacent to the first wall, and where the first end is configured to remain facing the bottom edge, with the guiding means being displaced in the second position, and where the casing comprises at least one guide, where the at least one guide defines a displacement of the guiding means between the first position and the second position, the displacement of the guiding means comprising a third position, where the third position is intermediate between the first position and the second position, characterised in that the first end of the guiding means is far from the outlet opening with the guiding means being displaced in this third position, with the guiding means being displaced in the first position, the first end is arranged flush with the top edge, and with the guiding means being displaced in the second position, the first end is arranged flush with the bottom edge.