Hello, I am completely uneased about hybrid vehicles. For explanation. For me a new vehicle is available this year. Actually I wanted to buy an E-Class, but after the whole discussion about driving bans, a trip to a reasonable hybrid would not be foreign to me either. Since I have come a little “into the years” however, I do not want to do without such small amenities. And then begins my question. I am interested in a GS 300h and would like to know whether it is possible to retrofit a heater? I mean, if there are any problems with hybrid vehicles with such retrofits? Thank you very much for your answers.