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I have a 2003 chevy malibu and the heater fan only runs on the 4 or 5 speed settings, will not run on the slow speeds. the fan motor was replaced about a year ago with the same conditions. Also when you are driving at night and you hit your brakes, the l
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Sounds like you have a blower
Sounds like you have a blower motor resistor.
1. Before servicing the vehicle, refer to the Precautions Section.
2. Remove the blower motor resistor wire harness connector.
3. Remove the blower motor resistor screws.
4. Remove the blower motor resistor.
Click image to see an enlarged view
Fig. Blower motor resistor removal
To install:
1. Install the blower motor resistor.
2. Tighten the blower motor resistor screws to 13 inch. lbs. (1.5 Nm).
3. Install the blower motor resistor wire harness connector.
4. Install the right closeout panel.
A blower motor resistor regulates blower motor speed by allowing only a certain amount of power to pass through the component. Once failed will only work at 1 or 2 speeds.