Mitsubishi Endeavor heater not blowing hot air despite thermostat replacement and fan functioning properly on Mitsubishi Endeavor

Some Mitsubishi Endeavor owners report experiencing issues with their heater not blowing hot air even after replacing the thermostat and confirming that the fan is operational. Common causes of this problem include a blockage in the heater core, which prevents hot coolant from circulating properly, and low coolant levels that hinder heat transfer to the heater core, resulting in cold air from the vents. Additionally, some owners may face blend door issues, where a malfunctioning blend door fails to mix hot and cold air correctly, and air pockets in the cooling system that impede coolant flow, leading to inadequate heating. Furthermore, a malfunctioning heater control valve can also prevent hot coolant from reaching the heater core. It is advisable for owners experiencing these issues to have a technician conduct a thorough inspection of the heating system to accurately diagnose and resolve the underlying problems.