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Blower stays on defrost

2005 Ford Taurus blower only works on defrost mode. Would it be blower motor resistor or actual knob switch?

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It would be a vacuum line has broken or the controller is bad. Most times it is the vacuum line. I run a new one from the engine to the controller. I drill a hole threw the firewall and secure the line threw it with silicone.

Posted on Jan 02, 2017

  • mpm359 Jan 02, 2017

    Could it be Blend Door Actuator

  • Randy Ohler Jan 03, 2017

    No, because the blend door motor changes the temperature from cold to hot. It is electrical. Older ones were cable.



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My 2000 ford explorer blower is only working in the back seat, how do i repair this

Make sure the knob is actually turning the switch, these brake on Ford cars/trucks all the time. Check fuses, check blower motor relay,Check for power at blower motor, verify resistors are functioning properly, replace blower motor.

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You don't say if it is climate control or manual. Either way, the relay gets power from two fuses, a 10amp for the relay and a 40amp for the actual motor. Did you check them with a meter to see if they have power with the key switch on ?
The relay sends power to the motor. The resistor and fan switch provide the ground circuit for the motor.
Does the motor have power and will it run if you jumper the ground circuit to the body ?

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Where's an 2005 Ford Focus Blower Motor resistor

Might be the Resistor pack located close to the blower. It has a flat connector with 4 or 5 wires, and two small screws holding in the duct. It may be a crispy critter. It happens... The blower moves air across it to keep it cool. The blower motor may be bad as well, or possibly the fan speed switch. May very well be the fuse for the blower as well. The blower connector may be loose. Let me know what you find.

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A/C fan motor only works on high. Need how to info to replace switch for fan motor control

Your problem more than likely isnt the switch for the fan control, but the actual Blower Motor Resistor is bad... here is a helpful diagram and "how to" on replacing the resistor.

Hope this helps...



  1. Remove the right-side instrument panel insulator.


  1. Remove the blower motor resistor.
1 Disconnect the electrical connector. 2 Remove the screws. 3 Remove the blower motor resistor. INSTALLATION
  1. To install, reverse the removal procedure.

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Blower motor only works on one speed

If it only works on high, replace blower motor resistor.

Jun 19, 2009 | 2004 Chevrolet TrailBlazer

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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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1 Answer

Why the heater motor/blower control knob works only on high,if i put it in low/medium range, it will turn-off

Very common when heater blower motor "Resistor" goes bad. In most cases they are either located under hood on firewall, passenger side, or under dash, passenger side, near blower motor. If I can confirm on location of it, I'll get back to you.

Mar 13, 2009 | 1997 Ford Taurus

2 Answers

1996 ford taurus

If you can, check if there is voltage at the blower motor connector with the ignition on and the engine not running. If you have voltage, the blower is bad. If no voltage, it may be a bad blower switch, the blower motor resistor assembly, or the wiring between them.

The resistor assembly is on the evaporator housing under the dash on the passenger side and near the blower motor. The glove box must be removed to check this and the blower. A thermal limiter resistor is built into the resistor assembly and will open, ie melt, with excessive heat.

Without more details on this, it appears either your blower motor or the blower motor resistor assembly is bad.

Oct 07, 2008 | 1996 Ford Taurus

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