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Why does the heater blower only work on high in your 1996 suburban?

The blower motor resistor has failed.

The blower motor resistor is an electronic device that controls the speed of the blower fan. When you change the speed of the blower fan, the resistor changes the amount of current that flows to the fan. If the resistor fails, the fan will only work on high because the resistor is no longer able to control the amount of current that flows to the fan.

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