Chevrolet Blazer heater not working despite functioning air and fan on Chevrolet Blazer

Some Chevrolet Blazer owners report experiencing heater issues despite the air and fan functioning properly. Common problems include a non-working blower motor, which can prevent air flow from the vents even if the fan is operational. Potential causes for the blower motor failure include a blown fuse, a bad relay, or a malfunctioning resistor or control module. Additionally, some owners find that the heat only works while driving, which may indicate low coolant levels, air pockets, a faulty heater core, an airlocked cooling system, or a malfunctioning thermostat. Heater core repairs can be complicated and expensive, and blower motor issues can lead to inadequate air movement, whether hot or cold. Furthermore, if the heater isn't blowing hot air, it could be due to the blower fan not receiving electrical power or the motor itself being burned out. A broken thermostat or a clogged heater core may also contribute to these heating problems. Addressing these potential causes is crucial for effectively troubleshooting and resolving the heater issue in a Chevrolet Blazer.