Most likely the little thermistor located behind the vent has been broken by some over eager cleaner thinking it was a bit of dirt. The thermistor is the temperature sensor.
Get a replacement CCM from a wrecker, with an intact thermistor, and replace yours.
Of course, you should clean out any dust and dirt from the vents and fans whilst you have your’s apart...
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XC90 R-Design MY2009, Black Sapphire Metallic. HP-Sound, RSE, Nav, Tel, ParkingCam, BLIS, ParkingHeater, RestHeat, Removable Towbar, Summer: CRATUS 20x8 on Pirelli Scorpion Zeros 255/45, Winter: NEPTUNE 17x7 on Continental WinterContact 4x4 235/65.
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