Question about 2001 Mercury Sable
Neither heater or ac works at all. When i checked the fan blower motor it was seized up and didnt spin until i forced it to now it spins all the way around just not very easily
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Posted on Jan 02, 2017
It's even odd that you were getting a step-type voltage when you first checked.
Many speed regulators are simple tapped resistors with the switch selecting which tap is connected to the motor.
More elegant controls would use a semiconductor (transistor) and a few other components to supply step-variable voltage to the motor.
To determine which is used on your car, you will at least need the electrical diagram for it, preferably an aftermarket service manual - Haynes or Chilton should be available at least in the US and Canada.
Those will contain not only the electrical info you now lack but possibly instructions that will aid in locating the controlling circuit.
I suspect that circuit is faulty; if the resistor type, it will be a device with mulitple taps, if solid state, a few parts on a small board.
Posted on Jun 18, 2008
Blower motor problem may resistor,have seen resistor and connector burnt. Resistor is located under dash on right side on heater case, check for damage.Radiator fan has 2 relays,high and low and also has a resistor,I would start with these items. Make sure fuses are ok.
Posted on Jul 05, 2009
SOURCE: ac blower motor
Check fuse supplying fan is not blown,
Check blower control switch is operating OK,
Check relay controlling fan is operating OK,
Check variable speed resistor pack is not faulty (the resistor pack is usually located in the blower ducting, in the blower airflow),
Check blower motor ground connection is not missing.
Posted on Aug 13, 2009
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