Hello, with my XC 60 I BJ 2010 unfortunately only a lukewarm ventilation comes from the heating slots in the interior. The Volvo dealer said it would be the heat exchanger to change. But you don’t necessarily have to use an original spare part. Has anyone already had experience with the exchange of the heat exchanger? Is this very complicated? Has the XC60 always installed an additional electric additional heating in addition to the heat exchanger? that these would only fit with vehicles without electric additional heating. Thank you!