Moin on the other hand, as described in the thread title, I’m obviously too stupid to set the heater over timer, so that the car gets warm in the interior. As a short info: I already had a V70 II with pre-heater and then a BMW E61 with pre-heater. On both the timer was set over BC. I never had a problem getting my cars warm the next morning. Now to the current case: At the moment I drive an XC70 D5 model year 2009. When buying a pre-heater I have a pre-heater A WEBASTO was installed by the dealer. Not to mention that the timer can now only be set when the engine is switched off is the usual press and turn the same as before. So I am able to adjust the timer. Only the problem is that the car is not warm the next morning in the interior. My dealer has the following advice ready: Before I turn off the car in the evening, I should have the temperature for the inside of the car when the engine is running. Then turn off the car and set the timer. So he did it on my car (tested by him in the workshop) and it would have worked. So said, did…. Stefan sets everything just like that, but the car stays cold. From the ventilation comes only a warm, cool air. Now my question to all heater users: first you have to put the temperature for the interior on Max. before you put the floor heating on Max. What am I doing wrong??? Thank you for your advice!! Doubt already about me…. Greeting Stefan