WPAC began broadcasting on April 1, 1998 as WZEA. WZEA featured a CHR format as "Zed 98-7." The station kept the format, but switched calls to WYSX (as "Yes FM") a short time later as a three-way simulcast with sister stations WYSI (96.7 Canton, now WYSX) and WYUL (94.7 Chateguay). This ended in July 2005 when 98.7 switched to the current oldies format with the WPAC calls and the "Yes FM" name and WYSX calls moved to 96.7. WYUL became its own independent CHR station.