The contact owns a 2017 Volvo XC90. The contact stated that while driving approximately 25 MPH, the low coolant level warning light was illuminated. The contact refilled the coolant reservoir; however, approximately one week later, the warning light was again illuminated. The vehicle was taken to the dealer who diagnosed that the small coolant hose was leaking. The vehicle was not repaired. The manufacturer was not informed of the failure. The failure mileage was unknown.