I replaced the blower motor last summer..old one burned out after blower wheel set screw came loose. After that, everything was working fine...mode in "COOL" and blower in "AUTO".
Now, in the cold months, with the selector switch set to "HEAT" and the fan control set in "AUTO", the heating elements come on but the blower doesn't run. After about 5 seconds, the heating elements turn off then about 5 seconds later the cycle repeats but still no blower. With the blower selector in "ON", the heating elements cycle on and off controlled by the T-stat while the blower runs constantly.
I really want auto-blower in both heat and cool mode.