Can´t you connect you phone directly to the car and listen Deezer through phone?
Anyway if not, than try Tunebite: How to record Deezer. Download the songs to PC, convert to necessary format (if needed), transfer to storage device. Done //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif