Question about 2000 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???

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You will need to replace the blower motor speed control resistor.

Posted on Sep 16, 2008

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SOURCE: blower motor speed

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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Hello Sanda.

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;
  1. Open the glove box.
  2. Flex both sides of the glove box bin inward near the top far enough for the rubber glove box stop bumpers to clear the sides of the glove box opening, then roll the glove box downward.
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  1. Reach through the glove box opening to access and disconnect the instrument panel wire harness connector for the blower motor resistor from the resistor connector receptacle.
  2. Reach through the glove box opening to access and disconnect the blower motor pigtail wire connector from the resistor connector receptacle.
  3. Remove the two screws that secure the blower motor resistor to the evaporator housing.
  4. Remove the blower motor resistor from the evaporator housing.
There you are. Thank you for using FixYa.

KL

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2 Answers

F150 2004 blower working only on high position.


this is because your blower motor resisters are burned out for speeds 1,2 & 3. High speed does not have a resister.

Replace the resister. If it goes a 2nd time, it is because your blower motor is failing & drawing too much current.

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

Easy repair. May need to access throught glove box which should open all the way down when you squeeze the sides in.

Go to tascafordparts.com for a discounted resister.
Please rate as solved problem if this is what you needed.

------------------------------------------------------------------------------
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:
  • The assembly is located on the passenger side of the plenum assembly behind the glove compartment (06010).
  • Three resistance elements are mounted on the resistor board to provide four A/C blower motor speeds.
  • 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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yes, all blower motors have them to control their speed, High, medium, low.. etc. I earn nothing by helping you, but my rating, a fixya rating and I will walk you through this

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1 Answer

Blower motor speed


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.

Nov 05, 2008 | 2002 Mercury Sable

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