- Buick Ownership
I have read a few threads and have not found anything that relates to my issue. The fan blows on all speeds. As I adjust the temperature dials to blow hot it does not change the temperature of the air that flows from the vents. The vehicle does not overheat. I have also switched the knob to every fan type and this also makes no difference. The fan types are: max, vent, bi-lev, htr, blend and def. Common sense would tell me that htr is for the heater and I have tried to leave it on this setting, to no avail.