Possible options:
* blower motor * electrical connection * switch assembly * resistor assembly * fuse There may be other possibilities but that's all I can think of at the moment.
It could be a couple of things, the ground wire to the motor may have become disconnected or over heated and melted or the positive wire for the blower which is located behind the radio has melted, which seems to be a problem with Saturn and was a problem with my 2000 Saturn ls. The wire is connected to a harness right behind the radio and is yellow.
did your heater switch go out all of a sudden or did some work like high work and low not work? if some worked your blower resister is most likely bad under your glove box
if the blower motor works most likely heater core is bad. need more info
its the blower resistor.
Depends on what you mean by heater will not work. If the blower motor will not work, it can be a blown fuse, bad blower motor, bad blower motor switch, or a defective blower motor resistor pack. If you mean that the blower motor works but there is no heat, then it can be a clogged heater core, thermostat stuck open, or defective heater control valve.
Check the 30 amp Blower fuse. If not that check the fan relay, if not that check the blower motor directly from a jump on the fan itself.
Blower wont work on all 5 speeds, usually the lower speeds tend to go first.
there is a condenser on the heater housing it has 2 bolts holding it into the housing, just below the heater motor, they go bad, i had the same problem on a 95 rodeo.
There might be a bad fuse causing the heater to not work. Check the fuses if they are all ok you may have a bad blower motor. when you turn the heater on and no air is blowing then it is your blower motor.
You most likely will have a bad blower resister........
replace heater relay and or heater blower motor
you have a bad heater core