Dahlin got his big break-through with the radio-program Galaxen ("The Galaxy") in the beginning of the 1980s. He later acted on popular TV-shows such as "Jacobs Stege" ("Jacob's Ladder") and "Caramba!". In almost every episode of Jacobs Stege, Dahlin used his famous quote "Skål, ta mig fan!" ("Cheers, dammit!"), which is still a popular cheer.
Guests on his radio show include famous Swedish comedian Täppas Fogelberg.
Dahlin studied the Russian language and often reported about happenings in Russian popular culture. He also went to Moscow with his TV-show Jacobs Stege, broadcasting with one of the most popular TV-shows in Russia at the time, The Morning Post, with Yury Nikolayev as host. Nikolayev later got invited to Sweden to be on Jacobs Stege, and brought with him actress Alla Pugacheva. Pugacheva and Dahlin became good friends and she was a frequent guest on his TV-show. One night he had the Soviet and US ambassadors as guest in his TV-show speaking to them fluently in their own language.
Jacob Dahlin also recorded with Alla Pugacheva, including the single "Superman" as a duet. The recording led to Pugacheva getting to record her first entire English-speaking album, Alla Pugacheva in Stockholm, which was released in 1985.
Dahlin had a fantastic ability to get super stars to join his show. Among them names like Diana Ross, Boy George, Princess Stéphanie of Monaco, Janet Jackson, Tina Turner, Cher, Donna Summer, Liza Minnelli.
Dahlin died in 1991 due to AIDS-related causes. Dahlin was homosexual. When Alla Pugacheva was competing in the Eurovision Song Contest in 1997 with her song Primadonna, she honoured Dahlin by dedicating it to him, saying "This song is for you, Jacob" in an interview.