Check fuse if the blower is not working. If it is then replace your heater core. if its not then replace your fan switch.
Cause Chevy runs deep
Driver error.
Your heater relay switch may be bad
Crossed wires that have corroded together can cause your heater and radio to stop working, at the same time. The heater and radio are not related in any other way.
#1: check the fuses!!!! you could save yourself a big headache if it's just a blown fuseCheck the bulbs if they are good check the grounds for the lights.
yes.
Bad heater core.
It would be bypassed by the mode door in the ducting under the dash. You may have have a problem with your mode door if your compressor is turning on when you select A/C. If the compressor clutch does not engage it is likely that there is an insufficient charge in the system, and you may have a leak.
The heater will stop getting hot when you're low on coolant. If the coolant is low enough the engine will overheat and it will be severely damaged.
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.
Need to know what it is not doing, post more info.
If you are absolutely, positively sure that your coolant level is not low......then your heater core could be plugged. Or the control that turns the coolant flow on/off to the heater isn't working. Make sure the control is working, the flush the radiator. Should cure the problem.