Chevy Prizm: Heater/Fan issue

Discussion in 'The Garage' started by oslama, Jan 26, 2011.

  1. oslama

    oslama Diamond Member

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    The fan does not work at low(1), med(2), med high(3) settings. It will work at the highest(4) but takes a while for the heater to warm up. The other thing i noticed is the headlights slightly dim when fan turned to highest setting.

    The fan did make a high pitch noise for the last 2-3 yrs and the battery is about 5 yrs old.

    could it be the fan switch or motor? also, do i need a new battery?

    TIA

    Specs:

    Chevy Prizm 1999, Automatic with 95,500 miles (half of the miles put on in last 4 yrs)
     
  2. 5150MyU

    5150MyU Senior member

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    Blower motor is most likely a bad resistor.When set on high speed the resistor is not used, at all other speeds it is.
    Pretty sure it is located behind the glove box. 5 screws-2 on bottom and 3 on top.
    Then 2 more screws hold in the resistor
    You may have to remove the "A" pillar trim to get to the right hand screws of glove box.
    The resistor should be a little left of the blower motor.
     
  3. herm0016

    herm0016 Diamond Member

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    great answer.
     
  4. pcgeek11

    pcgeek11 Diamond Member

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    This. I have seen this on Pontiacs as well. Although on the pontiac the resistors wer mounted on the firewall.
     
  5. woodie1

    woodie1 Diamond Member

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    Had a Toyota with this problem. The resistors were mounted on the board along with the blower speed switch. Whole assembly needed to be replaced. Easy to do.
     
  6. oslama

    oslama Diamond Member

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    Is the assembly board widely available at auto store or has to be ordered from dealer?
     
  7. Zenmervolt

    Zenmervolt Supermoderator<br>The Garage<br>Elite member

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    Generally those will be a model-specific part. While some parts stores may be able to order them, or you may be able to get them from someplace like Rock Auto online, I doubt anywhere would have them in stock locally.

    ZV
     
  8. 5150MyU

    5150MyU Senior member

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    Blower resister should be available at NAPA,etc.
    As for location my op, should be correct.
    I can give you an OEM number for the part although I don't know if it will be correct.