Fuse- Blower Motor- Wiring- Selector switch fail- i8f you still have heat to the heater core, if the heater core is cold, and the mottr is still hot... change the thermostat
Check fuse if the blower is not working. If it is then replace your heater core. if its not then replace your fan switch.
Need to know what it is not doing, post more info.
your car stalled?
Heater coil
There are a couple of reasons why a 1999 Oldsmobile Alero ac heater to stop working. The heater coil may need to be replaced or the HVAC blower motor may need to be replaced.
Most likely it would be a blown fuse in the fuse block.
if the rear ac is working then you probably have a damper door that is inoperative. this is in the heater/evaporator box. so if it isn't working then you will be heating and cooling at the same time out of the heater box.
First check the coolant level, a coolant leak would cause a heater to stop working- assuming you mean the blower is blowing but it isn't hot. A stuck thermostat will also cause you problems with your heat.
No...
Yes it could also cause the A/C to stop working.
It mite not be a fuse have you checked the vacume hoses that come from intake manifold this can cause the fan not to blow.
OK, did the blower motor actually just stop, or does it still blow but no heat?