In my Stilo Multiwagon 2007, the vehicle's inside heater stopped working some time ago. Well, I managed to change (with the help of one of the Guides) the 4-step heater controller, which did not solve the issue. Now, I think that the issue has to do with the heater control's resistor which according to my knowledge is there also under the cover of the control panel. But I cannot find any guide on how to change the heater control's resistor, and any other related relevant information. Has anyone any experience of this with Stilo? - Any help greatly appreciated.