RepairPal Certified shops can diagnose and repair your 2015 Volvo S60. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
You could have air in the system or a clogged radiator. Also check to see if your fans are working
Here is a link to find a shop near you who can do this.
https://repairpal.com/repair-shops
Alex