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Symptoms of bad blower motor relay - 1994 Jeep Grand Cherokee

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Blower motor resistor


Locate the blower motor and look around the outside and close to the motor for a 2-by-3-inch plate held on by two or four small screws. There will be an electrical connector plugged into it with five or six wires, depending on the vehicle type and heating and air conditioning type of control panel.
Test the resistor before replacing it. It is always recommended to test any electronic unit before replacing because there are a multitude of things that could cause the same symptoms. It only takes a few minutes and can qualify the assumption that a part is bad. It will save money to replace or repair the right part the first time.
Check the speeds by turning the fan conrol to all positions. Take note which fan speeds work and which speeds do not work. If the fan works only on one speed the blower motor resistor is very likely bad.

Check the fuses if the fan speeds do not work. The fuses for the interior heating and air conditioning fan are usually under the hood in the fuse and relay center. If the fuse looks good, then take it out and turn the ignition key on and use the volt meter set at 20 volts DC. Check to make sure that there is voltage to the fuse. If not, check for an open circuit to the fuse.

Check the relay to determine if there is power at the fuse. The relay should have two of the four terminals showing power. With the key on and the fan turned on, remove the relay and put it back in, listening for it to click. If it does not click, then replace the relay.

Check the voltage at the electrical connector on the blower motor resistor to see if the fuse and relay are good. Make sure that power is present at the connector with the key on and the fan switch on. There should be power at two terminals of the blower motor resistor. If only one terminal has power, replace the resistor. If two terminals have power, replace the blower motor itself. Remove the screws and unplug the connector to remove the blower motor resistor. Put the new one in its place by screwing it back in and plugging in the wiring connector.

Honda Parts.




May 28, 2012 | 2003 Ford Explorer

1 Answer

The fan isnt blowing so no heat no defrost etc..


CHECK SEE IF POWER GOING TO BLOWER MOTOR IF YES BLOWER MOTOR EITHER BAD OR HAS POOR GROUND SHORT IN WIRING CONNECTOR GOING TO BLOWER MOTOR AND RESISTOR.IF NO POWER GOING TO BLOWER MOTOR CHECK BLOWER MOTOR 30 AMP FUSE OR RELAY.IF BLOWER MOTOR OKAY AND FUSE RELAY OKAY THE AC AND HEATER CONTROL SWITCH COULD BE BAD.

Oct 22, 2011 | 2003 Pontiac Montana

1 Answer

My fan motor and windows and radio loose power, like its a loose wire or a short to the framae from the primary fuse box to the secondary one, how can i find the problem and fix it


COULD HAVE CORROSION INSIDE FUSE AND RELAY BOX CAUSING POOR CONTACT IN ELECTRICAL CIRCUITS. REMOVE FUSE AND RELAYS TO CONTROL CIRCUITS SPRAY A LITTLE ELECTRONIC CLEANER ALLOW IT TO DRY.CHECK BLOWER MOTOR RELAY IT COULD BE BAD OR BLOWER MOTOR RESISTOR BAD HOT BLOWER MOTOR TO SEE IF BLOWER WORK IF NO YOU HAVE FAULTY BLOWER MOTOR. IF BLOWER MOTOR WORKS WHEN YOU HOT WIRE BLOWER MOTOR CONTROL SWITCH COULD BE BAD.RADIO AND POWER PROBLEM COULD BE IN THE FRONT CONTROL MODULE IF CLEANING OUT CONTACT WITH ELECTRONIC CLEANER.DEALERSHIP HAS TO CHECK IT OUT.

Sep 19, 2011 | 2002 Chrysler Town & Country

1 Answer

Heater/ac blower motor does not work,,, check fuses, didnt check blower resistor,


CHECK BLOWER MOTOR RELAY ALSO, AND USE A TEST LIGHT TO SEE IF POWER GOING TO BLOWER MOTOR, IF YES BLOWER MOTOR FAULTY.IF NO POWER GOING TO BLOWER MOTOR AND FUSE AND RELAY OKAY CONTROL SWITCH COULD BE BAD,A RESISTOR BAD MOST OF THE TIME IF YOU DONT HAVE BUT A FEW FAN BLOWER CONTROL SPEEDS.

Jul 22, 2011 | 1999 Oldsmobile Alero

1 Answer

How do you change the front blower motor in a 2006 jeep commander? it's gone out twice now since we bought the jeep. the first time we had a mechanic fix it because it was under warranty. but now it's gone...


why not post the symptoms.? (all, not just dead) on all speeds?
the front just unscrews. its not hard, at all. nor worth 500 bucks.
but was that $450 for motor and $50 install? cant guess that ...

did you check all fuses first (in all fuse boxes , not just one)?????
FRONT OR REAR system? wow, with not symptoms i cant guess.
blow dead on HIIGH speed,
is it manual option or climate control HVAC option?
ATC or MTC systems (a means auto, m = manual)
did you replace the blower resistor first, if low speed fails.
did the hot wire test on blower fail, , ? do say this, as wasting a non good blower, is "over the top"

ill guess, front
  1. Disconnect the negative battery cable.
  2. Remove the instrument panel silencer from the passenger side of the instrument panel.
  3. Remove the glove box from the instrument panel.
  4. Disconnect the blower motor wire harness connector from the blower motor power module or resistor, depending on how equipped.
  5. Remove the three screws that secure the blower motor to the HVAC housing.
  6. Remove the blower motor from the HVAC housing.
rear is 16 steps. so..............................

all answers by me are USA cars, (usa forum it is)
and non Diesel, yes, its diffr.

now things that cause (hot wire to blower passes my tests)
failures of blower
  1. blower relay bad,
  2. input to relay wrong.
  3. fuse blown PDC #1 F1.
  4. A/c controller not commanding blow. there are 2 of these. modules.
  5. lots more but i need your unstated facts first. all of them.
all this and more is in the FSM book or at alldata.com diy for $15

order
Fuse 1 good , use a scan tool yet, to see if there are errors>?

Relay PDC relay blower motor front has 12vdc on in 87
ill pretend MTC, system
the 12vdc above goes to the blower, pin 1, is it>?
then the controller grounds pin 2 of blower on high
does it 0v? there? , it does so via ground G200.
if not its bad or the switch to it is bad.
the resistor block does not kill HIGH speed ever. cant. do that.
so is controller, or its switch bad, if not 0v here.
(keep in mind, my hot wire test passes on the blower )O


if 12vdc is at pin 1 on motor
you can jumper pin 2 to ground, fan will blow on
high, if not blower is bad (front)
it if blows now then the controller is bad or inputs wrong to it.
simple huh?



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Jan 14, 2011 | 2006 Jeep Commander

1 Answer

I have no power to my blower motor on my 2005 kia sportage and the fuse is not blown . i tryed my blower motor directly to my battery and the blower works finecan you help me please


You have a blower motor relay or a blower motor resister that could be bad.The relay is part # 1R2122 $20.79 at rockauto.com. You could jump the relay to see if that's your problem. The Resister is # RU474 $42.89. I would start with the relay. Your switch could also be bad. A simple 12V circuit tester will tell you if you are getting power to the relay terminals.

Aug 24, 2010 | 2005 Kia Sportage

1 Answer

1999 Isuzu Trooper Problem with Blower Motor, FUse Box, and exter


Did you find out a solution to your problem? I have a 1996 trooper that is showing most of the same symptoms that you have. I'm curious as to your fix. Was it simply a bad ground?

Apr 24, 2010 | 1999 Isuzu Trooper

1 Answer

Where is the fan in a 2000 dodge caravan


I am assuming you are asking about the Blower Fan and not the Radiator Fan?
The Blower Fan is located below the Passenger side Dash. It is inside the black Duct work.
May I ask what the problem is?
Is the Blower working or only working on High? If only on High then the Blower Motor is fine and the Blower Motor Resistor that controls the Low to High speeds is bad. This is located behind the Glove Box in the Dash and on the firewall. Remove the Glove Box to access. It is approximately 3 1/2 inches by 1 1/2 inches and has 3 to 4 wires going into it.
There is also a Front Blower Motor Relay located in the Relays and Fuses.
Before replacing the Blower Motor, get back with me (for free) and let me know. This may save you alot of money in the long run, saving you from purchasing parts you may not need!
Let me know if this helped, and let me know what the problems (symptoms/signs) are.
Contact me in the Comment Section of your Posted problem.

Feb 02, 2010 | 2000 Dodge Caravan

1 Answer

Blower working on top 2 settings but no air comeing from vents


Hi

Thanks for using FixYa. The possible causes due to which the blower is not working normally are fuse, blower resistor or a bad blower motor. Test the voltage at the blower with a test light. Please check the motor relay switch fuse under the dashboard. Use a multi meter to measure ohms for continuity. If these are fine, bypass the blower motor relay switch to make sure blower motor is running fine. Motor relay switch is right next to radiator fan relay switch under the hood. Pull out the blower motor relay switch to see 4 female pin holes. Test the relay switch using a 12 volts power source and a multi meter to measure continuity. If fan works after jumping the pin holes, then blower motor is fine but relay switch may be faulty. You may also need to replace the blower motor resistor. If still the problem persists, then you need to replace the blower motor.

Please do rate the solution and revert for further assistance.


Thanks
Rylee

Aug 09, 2009 | 1997 Honda Civic

3 Answers

Location of blower motor and relay(GM guy)


Behind the vacuum heater controls in the dash, they lead to a relay mounted there. That was the relay that was bad on my Dodge. It was a digital readout one.

Jun 30, 2009 | 1991 Chrysler New Yorker

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