:bananamani bought my comet couple of months ago in texas, off course they never used the heater today when i tried to turn it on i left it working for about one hour and nothing, no heat coming out. heater might not even been used in tx. what might be the issue.
Clogged heater core, heater core not hooked up at all. If it is a factory AC car...could be a vacuum door not opening or closing correctly or a heater bypass valve not working.