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The Blower Resistor is probably bad. If the resistor draws too much current it burns out and the fan will only work on high speed since on high speed the resistor is bypassed completely. On my 2002 prism this part is located below the glove box. It is usually white with 4 wires and held in by two screws. It will be obvious when removed if it burned out - it will be chared and the traces broken. THe Haynes repair manual (at any parts store) shows it in figure 16.4. Should be a $20 to $30(dealer) part. See: https://www.rockauto.com/applet3.html and type in part #158755 or navigate the file paths.

How to Install a Blower Motor Resistor

This is an extreamly easy thing to do... Here are clear and simple instructions.

1. Under your glove compartment, you will see a group of wires that are connected into a small, in my case yellow, irregular shaped piece of plastic; this is your blower motor resistor.

2. If you have a ratchet set, this is a 5 min job... if not, I feel sorry for you because you are going to have a hard time taking out the two screws. If you don't have a set, I suggest asking a neighbor to borrow one which will save you a great deal of time.

3. First unplug the wires from the resistor by gently lifting up on the plastic tab that connects them into the resistor.

4. Unscrew the resistors two screws and it should slide right out. You will see that the plastic card is charred and peeling if it is bad.

5. Pop your new resistor back in the slot, screw it in and snap the wires back in... it's just that easy!!!

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โˆ™ 2007-10-22 15:32:38
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Q: Why does the blower fan on a Prizm only work on high speed?
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