105.5 signed on the air in 1971 broadcasting ABC Radio Network's Today's Best Hits satellite-fed Hot AC service with the name "Y105".

In 2004, the station cut the satellite feed and provided local programming and changed monikers to "Sunny 105.5".

In September 2009, the station started dayparting with Hot AC material played throughout the day and retaining the Rhythmic-leaning CHR format after 9 pm.

This would end in March 2011, when the station returned to a more balanced CHR format throughout the day.

The regular format would return later in the day; however, the success of the stunt on the station's Facebook page would result in the creation of "The 90s Rewind Show", aired weekend mornings and hosted by former afternoon DJ Paul Myers.