Question about 1996 Mercury Mystique

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Control knob will not adjust fan speed on heater blower

The knob does not move as freely as it did and only low speed is available. I believe the control is bad but can not see what to take apart to get the blower motor control.

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  • 56 Answers

You need to replace the <<<<Blower Motor Resistor >>>Napa has the part 20-30 bucks it is located by the heater core under the dash.. I just replaced one in wife's car last month

Posted on Feb 03, 2009

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Blower motor speed not working


This is usually due to 1 of 3 possible problems.

  1. Bad blower motor resistor - attaches to blower motor and regulates fan speeds. Not uncommon to lose 1 speed at a time until you get stuck with only 1 speed
  2. Bad blower motor
  3. Bad heater control module - less likely but still possible the module is bad and the whole unit requires replacing

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I have a 2000 ford E350 van with front and rear air. the front blower motor runs at low speed, The front blower still runs on low even when the knob is set on medium or high. I do not know where the...


it's either the blower motor switch or blower motor resister. Resistor ?Heater Blower Motor Switch Removal Remove the battery (10655) ; refer to Section 414-01 . Remove the battery tray. Remove the screws. Remove the battery tray. Disconnect the heater blower motor switch resistor connector. Remove the heater blower motor switch resistor (18591). Remove the two screws. Remove the heater blower motor switch resistor. ----------------------------------- Switches Removal Disconnect the battery ground cable. Remove the center trim panel; refer to Section 501-12 . Remove the control assembly. Remove the screws. Remove the control assembly. Remove the A/C-heater function selector switch knob. Disconnect the vacuum harness connector. Disconnect the A/C-heater function selector switch connector. Remove the A/C-heater function selector switch. Remove the screw. Remove the A/C-heater function selector switch. Remove the temperature control switch knob. Disconnect the temperature control switch connector. Remove the temperature control switch. Remove the screw. Remove the temperature control switch. Remove the heater blower motor switch knob. Disconnect the heater blower motor switch connector. Remove the heater blower motor switch (18578). Remove the screw. Remove the heater blower motor switch. ----------------------------

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Heater blower only blows on low


This could be a few different things:

1.Check the power and ground connections on your blower motor, corrosion can cause high resistance and a slow blower speed.

2. Check your available voltage at the blower motor on the different settings. it should vary with high supplying 12volts, make sure to do this check with the blower motor still plugged in.

3. Connect the blower to a 12v power source and see if it runs at high speed.

If all else fails i would check your resistor pack, i would not suspect this because when it fails you usually just loose all speeds except for high, but it could happen.

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