Kia K900 A/C blowing hot air issue after service with no resolution despite coolant addition on Kia K900

Some Kia K900 owners report experiencing issues with their air conditioning blowing hot air even after service and coolant addition. Common causes for this problem include low or overcharged refrigerant levels, which can lead to ineffective cooling, and compressor malfunctions that hinder the cooling process. Additionally, dirty condenser or evaporator coils can reduce system efficiency, while a faulty blend door actuator may disrupt temperature control. Some owners also encounter problems with a defective evaporator temperature sensor or a bad AC pressure sensor, both of which can impact the system's performance. Electrical issues, such as a bad fuse or relay, may also contribute to AC problems. If coolant addition does not resolve the issue, it may be necessary to check the radiator fan plug, as suggested by other Kia owners, to ensure all components are properly connected. For persistent problems, seeking expert repair estimates and maintenance tips from professionals familiar with Kia K900 AC systems is recommended for further assistance.