Question about 2002 Mercury Sable

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Blower motor speed

The blower motor only works at high speed. I believe that there is a resistor assembly behind the glove box that might need replacement to correct the problem. How do I remove the glove box and is there anything to be aware of during the proceedure. & is there something else to look at??? I had the same problem until this morning when the blower stopped working altogether. I ordered the blower motor resistor but I don't have a clue where to find the the part to replace.

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The resistor is under the dash on the passenger side. You'll have to remove the protective accessibility hatch first & it will be right underneath there. You'll probably need a 3/4 wrench to remove the 2 bolts that hold it in place. If you replace the resistor & it works for a while then burns out, then it's your blower motor drawing too much voltage & that may need be the next thing to replace so it's like catch 22.

Posted on Nov 13, 2008


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The blower speed system on your car goes through a resistor to give various speeds.
The reason it still works on high is that when set on high it doesn't go through that resistor.

It gets direct battery voltage.
The resistor is not too expensive and easy to replace.

To replace;
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it is behind the glove box I think. It is in the plenum case where air blowing on it keeps it cool.

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Manual Climate Control System Outputs
Blower Motor Switch Resistor
Blower Motor Resistor Coils 9ba1105.gif Blower Motor Thermal Limiter 47afe58.gif The heater blower motor switch resistor has the following features:
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  • Depending on the heater blower motor switch position, series resistance is added or bypassed in the A/C blower motor circuit to decrease or increase A/C blower motor speed.
  • An overheating protective device (thermal limiter) will open the resistor coil circuit when the temperature reaches 121°C (250°F), interrupting the blower motor operation in all speeds except HI.
  • The thermal limiter cannot be reset and is not serviceable.

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