The contact owns a 2018 Volvo XC90. The contact stated that the A/C unit failed to operate as needed, causing the HVAC system to become inoperable. The vehicle was taken to a dealer where a diagnostic test was performed, which showed that the evaporator core inside the HVAC system was cracked and needed to be replaced. The contact attempted to have the part replaced; however, the contact was informed that the part was on backorder. The vehicle was not repaired. The manufacturer was notified of the failure but offered no assistance. The failure mileage was 100,000.