Blower motor on 2000 ford expd runs on high only ? where is resistor

Blower Motor Resistor

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Oct 20, 2010 - The blower motor resistor is located under the hood on top of the HVAC housing towards the center of the truck. Run a search on "blower+motor+ ...

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The blower motor relay is energized when the Blower Motor Control is set to the High position. This removes the blower motor resistors from the circuit and battery voltage is then applied directly from the HVAC BLO fuse (RH IP Accessory Wiring Junction Block) to the blower motor though the relay switch contacts. The blower motor then runs at high speed.

HVAC Blower Controls Circuit Description
The blower motor is a variable speed motor. The motor operates at a higher rate when voltage is increased to the maximum level.
The blower motor resistors reduce the voltage supplied from the A/C FAN fuse (LH IP Accessory Wiring Junction Block) when the blower control is set at low and medium speeds (speeds 1-4). The blower motor relay is energized when the Blower Motor Control is set to the High position. This removes the blower motor resistors from the circuit and battery voltage is then applied directly from the HVAC BLO fuse (RH IP Accessory Wiring Junction Block) to the blower motor though the relay switch contacts. The blower motor then runs at high speed.

Here are some possible solutions. http://repairpal.com/ac-blower-inop-due-to-failed-resistor-447 Blower Motor resistor replacement Silverado Sierra Tahoe Yukon Suburban...

How do I know it's my blower motor itself, blower motor resistor or a switchbox?

You view wiring diagrams an test electrical circuits with a DVOM - digital volt ohm meter .
Free wiring diagrams here http://www.bbbind.com/free-tsb
Enter vehicle info. year , make , model an engine size , Under system click on HVAC , under subsystem HVAC controls . Click the search button ,then the blue link.
Do you know how to do that ? Videos on youtube on electrical circuit testing .

I would say the switch

It is indeed a defective Blower Motor Resistor Pack. Look at the HVAC plenum on the PS firewall. The blower resistor is in the plenum right next to the blower motor. It is held in by 2 screws and has a 4-wire connector. This link may help you find it. http://www.explorerforum.com/forums/showthread.php?t=216963

you need to change your blower motor resistor, located in the blower motor housing....

Your blower motor resistor has gone bad, it should be located next to your blower motor in the car, held in place with a couple of screws, remove it and replace it. The resistor is responsible for making the blower motor run at slower speeds than high or (4). Let me know if this helps.

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. ----------------------------

sounds like blower motor resistor is shot.