1999 Frontier problem

The heater/AC fan is only working on high speed, position 4. Positions 1, 2 and 3 no longer turn the fan on. I can assume it is the switch that is
bad?
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Or resistors
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it's the definitely the relay . it's a VERY common problem . i have an 01 frontier and mine is located under the glove box on the bottom of the blower housing . it plugs in . a 99 might be different . good luck , D.

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