I have a 1990 Toyota Corolla and it did the same exact thing as yours and eventually only high speed would work and further investigation revealed the fan switch in the heater control assembly as the culprit. The contact points in the switch had all burned up except for the high setting so I went to the dealer and got a new one and no complaints yet.
Jvrsshurricane is right, but more often the resistor is the culprit. High speed = no resistance, low speed = most resistance
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.
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