CHLX was licensed by the CRTC in 2001, and launched on September 23, 2002.
Until 2008 it was branded as Couleur FM, airing classical music. In 2008, after a license amendment was accepted by the CRTC, it became Planète 97,1, an adult contemporary-formatted station, with 20% of its airtime devoted to jazz.
On July 11, 2014, it was announced that CHLX would flip to Hot AC as 97.1 Rythme FM on August 25th, as part of a licensing deal between Cogeco and RNC. CHLX became the first non-Cogeco station to carry the Rythme FM format (other than CJEC-FMQuebec City, which was briefly affiliated with Rythme FM after being sold by Cogeco to another broadcaster).