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Re: 01 Impala fan only works on #5 setting, 1 thru 4 don't work...
If you have a manual HVAC system, it's classic blower motor resistor. Water leaking in through bad cowling seal, etc. will drip down onto the blower motor, blower motor resistor and wiring. Positions 1 - 4 from the HVAC head unit feeds to the resistor matrix to vary the blower motor speed. In position 5 the resistor is bypassed and the blower motor is fed direct battery power via the HVAC HI speed relay so the blower itself is probably OK.
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