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Hvac blower motor wiirin diagram - Heating & Cooling

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Look on the motor the diagram is on it or check the diagram on the furnance or condensor

Posted on Aug 21, 2010

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Posted on Jan 02, 2017

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My 2004 saturn air conditioning wont blow air unless u turn right how do I fix it


Test the electrical circuits for the blower motor . Look at a wiring diagram and find any connectors or ground connections an see if any are loose .Free wiring diagrams here http://www.bbbind.com/free_tsb.html Enter vehicle info. year , make , model and engine size . Under system click on HVAC ,under subsystems click on HVAC controls . Then click on the search button . Watch this video
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Heater Blower Motor Troubleshooting

Aug 26, 2017 | Saturn Cars & Trucks

1 Answer

I have a 2007 HHR, my temp gauge stops working and the same time the a/c stops blowing cold air...I called myself checking fuses and a relay, can you help?


You mean the blower motor stops blowing air , the A/C compressor is still engaged ? The temp gauge shouldn't have anything to do with the blower motor .But stranger things have happened on these systems when they are controlled by a electronic module (BCM )
Circuit/System Description
The instrument panel cluster (IPC) displays the engine coolant temperature as determined by the engine control module (ECM). The ECM sends the temperature data via high speed GMLAN serial data to the body control module (BCM). The BCM then sends the information via low speed GMLAN to the IPC in order to display the engine temperature.
The BCM applies voltage to the blower motor through the HVAC relay. The resistors and the blower motor are in a series circuit. The following list represents the number of resistors in series with the blower motor per particular speed request:
• Low speed--4 resistors
• Medium 1 speed--3 resistors
• Medium 2 speed--2 resistors
When the operator requests High speed, the HVAC control assembly applies ground directly to the blower motor through the high blower motor control circuit.
Do you know anything about automotive serial data communications ? GMLAN Is general motors version of C.A.N controller area network .

How to Diagnose Controller Area Network CAN

Do you know anything about diagnosing automotive electronics ? Using a digital volt ohm meter ? Using wiring diagrams to pin point locations in a electrical circuit for testing ? Do you know what a factory componet location diagram is ? It takes more then looking at fuse's an relays , to see if current is flowing in a electrical circuit .

Electric Testing Techniques You Need to Know

ECM Inputs and Outputs Diagnosis

http://www.bbbind.com/free_tsb.html Free wiring diagrams ! Enter vehicle info. Year , make , model and engine size ! Under system click on HVAC , under subsystem HVAC Controls . Then click the search button , then click the first blue link . This is the blower motor control diagram . Do you know how to read a wiring diagram ?

Apr 30, 2017 | Cars & Trucks

1 Answer

Diagram showing location of blower motor and installation for 2004 cadallic sedan 8 cyl


. How do you know you need one ? Did you do electrical circuit testing ? Is your HVAC - heater / A/C system automatic or manual ? Could need a blower motor control processor ! Electronic module . Did you check the blower motor fuse ? HVAC /BLO fuse 40amp in the rear fuse block ? Under the back seat ?

Apr 18, 2017 | Cars & Trucks

1 Answer

The ventilation fan for heat/ac is not working. The fuses all seem the be ok. Any thing else to look for


Did you check the proper fuses for voltage? Some fuses are hot all the time, some go hot with the key on. Even if fuses are good, if no voltage the circuit is still dead. I guess your talking about the blower motor? Can you hear it running? I don't know if you auto hvac or manual hvac? I don't know if your talking about front or rear blower motor?
Get at the blower motor, if two wire connector, that should be voltage and ground. Turn on the hvac controls, check for voltage and ground at the blower motor connector. If good voltage and ground with no blower action, suspect the blower motor.

It is possible to use jumper wires from the battery for voltage and ground to blower motor connector, just for testing to see if blower motor will run, use an inline fuse, just in case.
If you want wiring diagram, I need more info.

Oct 02, 2016 | 2007 Honda Odyssey

1 Answer

Air/heater wont shut off


If the blower motor won't shut off, pull the blower motor relay in under hood fuse box. That should kill it till you find the problem. I don't know if you have automatic hvac or manual hvac?
Can you check for hvac trouble codes? Some of the national brand auto stores will check codes for free.
If blower motor wiring connector has both voltage and ground, it will run as long as the battery has voltage.
I saw two different wiring diagrams on your blower motor, I don't know which one applies?

Apr 25, 2016 | 2006 Mercury Grand Marquis

1 Answer

My front heater won't blow. we have checked the resistor, changed the blower motor, thermostat and relay. Any ideas as to what it could be/ I do daycare and need the front heat.


In the diagram, check fuse 10--40 amp, not only check the fuse, check the fuse circuit for voltage with hvac on. Use a test light to check for voltage. See the wires going to front blower motor, that is voltage and ground, check them both. Also, the front blower module could be causing a problem? The diagram is for automatic hvac.
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Dec 03, 2015 | 2001 Dodge Grand Caravan

3 Answers

I have a 2000 chevy blazer the blower works on 1 2 and 3 but it wont work on 4 I changed the dash switch and the resister but that didn't work


There is a relay in the under hood fuse box , blower motor relay .When switched to high it energizes the relay allowing power from the HVAC fuse /30 amp to flow direct to the blower motor. from pin 30 to pin 87 , if you look on the side of the relay there is a diagram .For all other speeds the current flows from the switch through the resistor through pin 87a to pin 30 on to the blower motor ! Check the HVAC fuse in the under hood fuse block .IF the fuse is good check for continuity between the fuse side with out B+ that means pulling the fuse and using a volt meter to see which side has power and checking the side that doesn't have power to pin 87 at the relay socket ! Probably a bad fuse or stuck relay . Pull that relay and try a different one. You can get wiring diagram at www.bbbind.com click on technical information ,then click on Technical Service Bulletins & Wiring Diagrams .then on next page go down to the bottom and click on I agree . next page click wiring diagrams ,then just fill in you vehicle information .then HVAC system . click on diagram, then you will see 7 links , click on the 5th one and that's the diagram for the blower motor circuit !

Jan 11, 2015 | 2000 Chevrolet Blazer

2 Answers

Heater won't turn on sometimes, or turns off by itself and only works on High.


I can't diagnose unless you can do some testing? This is part of diagram for automatic hvac. At the blower motor, terminal B is voltage, terminal A is ground. Use a test light, check voltage and ground with hvac on, Have to check when problem is ongoing. If good voltage and ground with no blower action, suspect the blower motor is faulty. Of course, if your missing voltage or ground, have to track that circuit. Faulty blower motors may run intermittently. When problem is ongoing, hvac on, you can try tapping blower motor with screwdriver handle see if it starts running, if it does, I suspect the blower motor has a problem. Check hvac trouble codes, where applicable.
blower motor-glvii1gxkt1idx3zyylb1u0i-1-0.jpg

May 30, 2017 | 2001 Buick Century

1 Answer

Diagram for the placement of the fan blower motor in a 2003 Dodge ram 1500 truck


From autozone.com
2003-04 Vehicles

CAUTION On vehicles equipped with airbags, disable the airbag system before attempting any steering wheel, steering column, or instrument panel component diagnosis or service. Disconnect and isolate the battery negative (ground) cable, then wait two minutes for the airbag system capacitor to discharge before performing further diagnosis or service. This is the only sure way to disable the airbag system. Failure to take the proper precautions could result in an accidental airbag deployment, possible personal injury or death.

NOTE The blower motor is located on the passenger side of the vehicle under the instrument panel. The blower motor can be removed from the vehicle without having to remove the HVAC housing.
  1. Disconnect and isolate the battery negative cable.
  2. Disconnect the wire harness connector from the blower motor.
  3. Remove the three screws that secure the blower motor to the HVAC housing.
  4. Remove the blower motor from the HVAC housing by rotating and tilting the blower motor as needed for clearance.
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Fig. View of the resistor block screws (1), blower motor resistor (2), resistor block wire connector (3), blower motor screw (4), blower motor (5), blower motor wire connector (6), blower motor screw (7), HVAC housing (8), wire harness retainer (9), blower motor screw (10)

    To install:
    1. Align and install the blower motor into the HVAC housing.
    2. Install the three screws that secure the blower motor to the HVAC housing. Tighten the screws to 20 inch lbs. (2.2 Nm).
    3. Connect the wire harness connector to the blower motor.
    4. Reconnect the battery negative cable.

Sep 23, 2010 | Dodge Ram 1500 Cars & Trucks

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