Nissan Frontier cabin blower only emits hot air and cannot be turned off or switched on Nissan Frontier

Some Nissan Frontier owners report experiencing issues with their cabin blower only emitting hot air and being unable to turn off or switch the temperature settings. This problem may be caused by a low coolant level, which can lead to the heater blowing hot air continuously. Additionally, some owners find that a clogged heater core restricts coolant flow, resulting in constant hot air output. A malfunctioning blend door actuator, which controls the air temperature from the vents, can also be a culprit, necessitating replacement. Furthermore, issues with the HVAC control unit may hinder temperature control, requiring inspection and potential replacement. To address these concerns, it is advisable for owners to check the coolant level, inspect the heater core for clogs, test the blend door actuator, and examine the HVAC control unit for malfunctions.