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What causes the heater blower motor in an 2002 Trailblazer to work speeds 1-4 but not speed 5?

The most likely cause for this issue is a faulty blower motor resistor, which is located in the HVAC housing between the blower and the evaporator. The blower motor resistor is responsible for controlling the different blower speed settings, so when it fails, it can cause one or more speeds to stop working. It is recommended to have the blower motor resistor inspected and replaced if necessary to resolve the problem.
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