Buick LeSabre heater not functioning, blowing cold air while A/C and normal air vent work fine on Buick LeSabre

Some Buick LeSabre owners report experiencing issues with their heater blowing cold air while the A/C and normal air vents function properly. This problem may be linked to several factors, including malfunctioning blower motors that only allow heat to be felt when the vehicle is in motion. Additionally, heater core problems, such as insufficient hot coolant reaching the core, can lead to cold air being circulated. Issues with the coolant system, including low levels or poor circulation, may also affect heater performance. Furthermore, failed mode door actuators can disrupt temperature regulation and airflow direction. To resolve these issues, it is advisable for owners to have a technician diagnose the problem, check the blower motor, verify the heater core and coolant system functionality, and inspect the mode door actuators for proper operation.