In 1976, then-owner Radio-Nord Communications was granted a license from the CRTC, in which the station would operate as Radio-Canada's private affiliate of what was then called "Première Chaîne"; also included was a rebroadcaster, CHLM-FM-1 at Lithium Mines, serving nearby Val-d'Or, operating on 97.3 MHz with effective radiated power of 52,000 watts. In 1979, CHLM-FM-1 was authorized to change frequency from 97.3 MHz to 103.5 MHz and to increase effective radiated power from 52,000 watts to 55,300 watts.
CHLM-FM and CHLM-FM-1 signed on the air by 1980; eventually, CHLM-FM-1's city of license would have changed to Amos, and broadcasting on another different frequency, 91.5 MHz.
On September 7, 1989, the station was denied a licence to add a transmitter at Ville-Marie, Quebec on 100.5 MHz.  In 2002, the CBC would add a transmitter of their own serving Ville-Marie, CBFY-FM 89.1, rebroadcasting CHLM-FM.
In February 2000, CHLM-FM and CHLM-FM-1 became full-time re-broadcasters of the Radio-Canada network.
The station's local programs are Les Matins en or in the mornings from 6 a.m. to 9 a.m., and Le Radio-magazine in the afternoons, 4 p.m. to 6 p.m. On public holidays, its local programs are replaced with Chez nous le matin from CBF-FM-8 in Trois-Rivières and L'heure de pointe from CBJ-FMSaguenay. The Saturday morning program, Samedi et rien d'autre, originates from CBF-FMMontreal.