My 2005 L322 Rover's air conditioning will start blowing really hot air suddenly when the air has been on for a while. The RR dealer has checked for fault codes while this is occurring, but found no codes recorded. They told me it was practically a 2 day job to take out the dash and repair and replace the blend motor or related components for the system. It is estimated to cost a couple of thousand dollars or so just in labor in addition to the price of the parts. In the meantime, it was recommended I try turning the temperature controls all the way to the hottest setting for short time, and then cycle the temperature control all the way to cold. This has worked fairly reliably for now, with me having to sometimes cycle the temperature controls this way for a couple of cycles. I am more than slightly annoyed at the prospect of paying up to 2500 dollars or more for this repair, and am wondering if there is anyone out there who knows what the exact cause of this condition is? I am wondering if it is purely a mechanical part worn in the blend door which the blend motor cannot overcome, or is this a blend motor which is losing its efficiency and or torque. Please share any thoughts or referrals to other posts. I did a search on posts here but only found one partial one which was related to icing of the core, which needed to unthaw before rebooting. Thanks very for your thoughts.