Edit: After half day, my wife’s Mac started having the same problem. I have then applied the solution that I found in the Apple
iHeartRadio for iOS Updated with Support for CarPlay
Radio streaming service iHeartRadio has updated its official iOS app to include support for Apple’s CarPlay iOS vehicle integration feature.
Users can now search and play any live or Favorited radio station through their CarPlay-compatible in-dash car system, and can also listen to archived on-demand episodes from multiple categories like News, Sports, and Comedy.
This newest update also brings a new Today Widget for the Notification Center which allows users to access recently played stations quickly. Apple announced in June that iHeartRadio would be getting CarPlay support along with other popular apps like Beats Music, MLB At Bat, and Spotify, which received its CarPlay update earlier this month.
iHeartRadio is a free app for iOS devices and can be downloaded through the App Store.