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Note to all: If you have Automatic Temp Control (electronic temp setting), there is no resistor: just the blower control module (which you'll see just to lower right of blower fan, 2 screws hold it in, pop off the fan and you'll see it). The stores will sell you a resistor or condensor, or even a switch, but it has none of the above!!!!

(I spent a week looking everywhere for what the stores were saying was there somewhere behind fan!)

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โˆ™ 2007-08-11 18:50:59
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Q: Where is the blower motor resistor on a 2000 Ford Explorer 4.0 the wires from the blower motor go into the harness not to the resistor as normal?
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You must have the automatic controls for you HVAC system. The blower power module is what has failed and needs to be replaced.This view is from the firewall side of the HVAC case but you can see the module location on the bottom of the case [http://www.justanswer.com/view_image.aspx?href=http://ww2.justanswer.com/uploads/Joecamel90/2009-10-05_101545_blo.gif] If you have the AC Auto controls, you do not have a resistor, you have a power module. Here are instructions covering both the resistor and the module from the service manual:BLOWER MOTOR RESISTORDESCRIPTIONA blower motor resistor is used on this model whenit is equipped with the manual heater-A/C control(Fig. 9). Models equipped with the optional Auto-maticTemperature Control (ATC) use a blower powermodule, instead of the blower motor resistor. Theblower motor resistor is installed in a mounting holein the heater/AC housing, directly behind the glovebox opening of the instrument panel. The resistorconsists of a molded plastic mounting plate with twointegral connector receptacles. Concealed behind themounting plate within the heater/AC housing arefour coiled resistor wires contained within a protec-tivestamped steel cage. The resistor mounting plateis secured with two screws to the heater/AC housingand is accessed for service by rolling down the glovebox from the instrument panel.The blower motor resistor wires will get hot whenin use. Do not touch the resistor wires or the protec-tivecage if the blower motor has been running. Theblower motor resistor cannot be adjusted or repairedand, if faulty or damaged, it must be replaced.OPERATIONThe blower motor resistor is connected to the vehi-cleelectrical system through a dedicated take outand connector of the instrument panel wire harness.A second connector receptacle receives the pigtailwire connector from the blower motor. The blowermotor resistor has multiple resistor wires, each ofwhich will reduce the current flow through theblower motor to change the blower motor speed. Theblower motor switch in the manual heater-A/C con-troldirects the ground path for the blower motorthrough the correct resistor wire to obtain theselected speed. With the blower motor switch in thelowest speed position, the ground path for the motoris applied through all of the resistor wires. Eachhigher speed selected with the blower motor switchapplies the blower motor ground path through fewerof the resistor wires, increasing the blower motorspeed. When the blower motor switch is in the high-estspeed position, the blower motor resistor wiresare bypassed and the blower motor receives a directpath to ground through the blower motor switch. Theblower motor resistor may be diagnosed using con-ventionaldiagnostic tools and methods.DIAGNOSIS AND TESTING - BLOWER MOTORRESISTORRefer to the appropriate wiring information. Thewiring information includes wiring diagrams, properwire and connector repair procedures, details of wireharness routing and retention, connector pin-outinformation and location views for the various wireharness connectors, splices and grounds.(1) Disconnect and isolate the battery negativecable.(2) Disconnect the instrument panel wire harnessconnector for the blower motor resistor and theblower motor pigtail wire connector from the resistorconnector receptacles.(3) Check for continuity between each of theblower motor switch input terminals of the blowermotor resistor and the resistor output terminal. Ineach case there should be continuity. If OK, repairthe instrument panel wire harness circuits betweenthe blower motor switch and the blower motor resis-toror the blower motor pigtail wires as required. Ifnot OK, replace the faulty blower motor resistor.REMOVALWARNING: THE BLOWER MOTOR RESISTOR MAYGET VERY HOT DURING NORMAL OPERATION. IFTHE BLOWER MOTOR WAS TURNED ON, WAITFIVE MINUTES TO ALLOW THE BLOWER MOTORRESISTOR TO COOL BEFORE PERFORMING DIAG-NOSISOR SERVICE. FAILURE TO TAKE THIS PRE-CAUTIONCAN RESULT IN PERSONAL INJURY.CAUTION: Do not operate the blower motor with theblower motor resistor removed from the circuit.Failure to take this precaution can result in vehicledamage.(1) Disconnect and isolate the battery negativecable.(2) Open the glove box.(3) Flex both sides of the glove box bin inwardnear the top far enough for the rubber glove box stopbumpers to clear the sides of the glove box opening,then roll the glove box downward.(4) Reach through the glove box opening to accessand disconnect the instrument panel wire harnessconnector for the blower motor resistor from theresistor connector receptacle (Fig. 10).(5) Reach through the glove box opening to accessand disconnect the blower motor pigtail wire connec-torfrom the resistor connector receptacle.(6) Remove the two screws that secure the blowermotor resistor to the evaporator housing.(7) Remove the blower motor resistor from theevaporator housing.INSTALLATIONCAUTION: Do not operate the blower motor with theblower motor resistor removed from the circuit.Failure to take this precaution can result in vehicle(1) Position the blower motor resistor into theevaporator housing.(2) Install and tighten the two screws that securethe blower motor resistor to the evaporator housing.Tighten the screws to 2 N•m (17 in. lbs.).(3) Reconnect the blower motor pigtail wire con-nectorto the blower motor resistor connector recep-tacle.(4) Reconnect the instrument panel wire harnessconnector for the blower motor resistor to the resistorconnector receptacle.(5) Flex both sides of the glove box bin inwardnear the top far enough for the rubber glove box stopbumpers to clear the sides of the glove box opening,then roll the glove box upward.(6) Close and latch the glove box.(7) Reconnect the battery negative cable.POWER MODULEDESCRIPTIONA blower power module is used on this model whenit is equipped with the optional Automatic Tempera-tureControl (ATC) (Fig. 22). 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The blower power module cannotbe adjusted or repaired and, if faulty or damaged, itmust be replaced.OPERATIONThe blower power module is connected to the vehi-cleelectrical system through a dedicated take outand connector of the instrument panel wire harness.A second connector receptacle receives the pigtailwire connector from the blower motor. The blowerpower module allows the microprocessor-based Auto-maticTemperature Control (ATC) heater-A/C controlmodule to calculate and provide infinitely variableblower motor speeds based upon either manualblower switch input or the ATC programming using aPulse Width Modulated (PWM) circuit strategy. ThePWM voltage is applied to a comparator circuitwhich compares the PWM signal voltage to theblower motor feedback voltage. The resulting outputdrives the power module circuitry, which adjusts thevoltage output received from the blower motor relayto change or maintain the desired blower speed. 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Refer to the appropriate diagnostic infor-mation.(1) Disconnect and isolate the battery negativecable.(2) Open the glove box.(3) Flex both sides of the glove box bin inwardnear the top far enough for the rubber glove box stopbumpers to clear the sides of the glove box opening,then roll the glove box downward.(4) Reach through the glove box opening to accessand disconnect the instrument panel wire harnessconnector for the power module from the module con-nectorreceptacle.(5) Reach through the glove box opening to accessand disconnect the blower motor pigtail wire connec-torfrom the power module connector receptacle.(6) Remove the two screws that secure the powermodule to the evaporator housing.(7) Remove the power module from the evaporatorhousing.INSTALLATIONWARNING: ON VEHICLES EQUIPPED WITH AIR-BAGS,DISABLE THE AIRBAG SYSTEM BEFOREATTEMPTING ANY STEERING WHEEL, STEERINGCOLUMN, OR INSTRUMENT PANEL COMPONENTDIAGNOSIS OR SERVICE. 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