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Blower motor runs on 3 and 4 only - 2001 Honda Accord

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Sounds like its the switch control replace that and all settings should work again hope this helps

Posted on Nov 18, 2013

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1 Answer

Blower works on 3 and 4 is my blower motor no good


If the motor runs on 3 and/or 4, the motor is O.K. Your switch or resistor is the most likely problem.

Jun 27, 2014 | 2002 Ford F150 Regular Cab

1 Answer

Blower control


Check connector at the blower motor. The ground burns up in the connector. Also try this turn the blower motor on speed 3 then smack the bottom of the blower motor. If it starts blowing the brushes in the motor are worn out. Replace the blower motor.

Feb 01, 2014 | Buick LeSabre Cars & Trucks

1 Answer

Blower stays on after key is removed, now a/c works in front once I hit the highway.


Which of these systems does your vehicle have ?
HVAC Systems - Automatic
Blower Motor Control Processor
The blower motor control processor controls the speed of the blower motor by increasing or decreasing the voltage drop on the ground side of the blower motor. The HVAC control module provides a voltage signal to the blower motor control processor over the blower motor speed control circuit. As the requested blower speed increases, the HVAC control module increases the amount of time that the speed signal is modulated to ground. As the requested blower speed decreases, the HVAC control module decreases the amount of time that the signal is modulated to ground.

HVAC Systems - Manual
Air Speed - Front Control
The blower motor forces outside air into the vehicle's interior. The vehicle operator determines the blower motor's speed when the driver places the blower switch in one of 5 blower speeds. The blower motor will always operate in any switch position other than OFF, as long as the ignition switch is in the RUN position. The blower motor and mode switches are located within the HVAC control module. The blower motor OFF input is connected in series with the HVAC control module by the off blower motor control circuit.
Depending upon the selected speed, power is provided to the blower motor from either the ignition 3 voltage or battery positive voltage circuits from the fuse block. The battery positive voltage circuit only provides power when the High blower switch position is selected. Power and ground are provided to the HVAC control module by the ignition 3 voltage and the ground circuits.
Low Blower Speed
When the Low 1 blower speed is selected, the HVAC control module applies voltage to the blower motor resistor assembly through the low blower motor control circuit. Voltage is divided between 4 series resistors, a blower relay, and the blower motor to achieve the desired blower speed. The blower motor is grounded through the ground circuit.
Medium Blower Speeds
When the Medium 1 blower speed is selected, the HVAC control module applies voltage to the blower motor resistor assembly through the medium 1 blower motor control circuit. Voltage is divided between 3 series resistors, a blower relay, and the blower motor to achieve the desired blower speed. The blower motor is grounded through the ground circuit.
When the Medium 2 blower speed is selected, the HVAC control module applies voltage to the blower motor resistor assembly through the medium 2 blower motor control circuit. Voltage is divided between 2 series resistors, a blower relay, and the blower motor to achieve the desired blower speed. The blower motor is grounded through the ground circuit.
When the Medium 3 blower speed is selected, the HVAC control module applies voltage to the blower motor resistor assembly through the medium 3 blower motor control circuit. Voltage is divided between a series resistor, a blower relay, and the blower motor to achieve the desired blower speed. The blower motor is grounded through the ground circuit.
High Blower Speed
When the High blower speed is selected, the HVAC control module applies voltage to the blower motor resistor assembly through the high blower motor control circuit. The voltage energizes the blower relay, causing the blower motor to be connected directly to the battery positive voltage circuit. The blower motor and blower motor relay are grounded through the ground circuit.

HVAC Control Module
The HVAC control module is a class 2 device that interfaces between the operator and the HVAC system to maintain air temperature and distribution settings. The battery positive voltage circuit provides power that the control module uses for keep alive memory (KAM). If the battery positive voltage circuit loses power, all HVAC DTCs and settings will be erased from KAM. The body control module (BCM), which is the vehicle mode master, provides a device on signal. The control module supports the following features:

Feb 09, 2018 | 2005 Chevrolet Tahoe

1 Answer

The heater fan just stopped...


Check fuse #14(10amp) located in fuse box under driver steering wheel behind the lower dash cover.
Check fuse#12(40amp) located in fuse box under hood.
Replace fuse(s) if any are blow.

If fuse are good.Check blower and transisto next.
Do steps 1-3 with turn key on
1. Unplug connector and check for 12v at the blue/white wire at the blower motor(2-NAT)
-if there's no voltage you might have a bad relay or open in the wire
-if there's about 12v, go to step 2
2.Plug connector for blower motor and unplug connector for blower transistor(4-NAT). Take a jumper wire and jump the blue/black wire to body ground.
-if blower does not run, replace blower motor
-if blower motor runs, go to step 3
3.check the black wire at(4-NAT) for good ground.
-if you have good ground, then replace blower motor transistor.
good luck

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Jan 18, 2011 | 2004 Honda Element

2 Answers

Blower doesnt work on all speeds


Step 1: Check fuse
Step 2: Change relay (usually can swap with another relay in the fuse box and try it)
Step 3: Check connection on switch
Step 4: Replace Switch
Step 5: Check connection on blower motor
Step 6: Replace blower motor

Chevrolet has a bad reputation for the connection and/or switch malfunction for the blower motor. I changed all 6 items in my truck in a 3 month span as all 6 appeared one right after the other.
Good luck.

Nov 11, 2010 | 2006 Chevrolet Cobalt

1 Answer

My blower motor now only runs in the "high" postion. I suspect this is just the switch since the blower does run. 2001 Jeep Grand Cherokee (198,000)


no that is your blower motor resistor. find it in or near the heater box by your blower motor should have 3 wires going to it remove the connector remove the resistor and replace it, that should solve your problem

Aug 05, 2010 | 2001 Jeep Grand Cherokee

1 Answer

The HVAC blower fan on my 2001 Pontiac Aztec stopped working on settings 1-3 several weeks ago. Last week it stopped working at setting 4 and today it stopped working all together. What is the most likely...


the blower not working on settings 1-3 is the blower motor resistor. this limits the power provided to the blower motor itself to change the speed. at setting 4 it is getting full power. since it quit on 4 also, i would still say the resistor needs to be replaced first, then see if the blower comes back. you may also need a blower motor. if you have a voltmeter you can just turn the switch to 4 and see if the motor is still getting 12 volts. if it is and doesn't run, it needs a blower motor too. if it's not, then its just the resistor

Feb 24, 2010 | 2001 Pontiac Aztek

1 Answer

Replace the blower motor.


Under the glove box:

Disconnect the blower motor power transistor electric connector (the transistor is far over to the left, with a curly wire coming down to it.)

Remove the blower motor power transistor mounting screws the remove the transistor.

Disconnect the electrical connector from the blower motor (slightly to the right of the motor).

Remove the blower motor mounting screws and then remove the blower motor assembly.
(there are, I believe, 3 screws; 1 just below the connector; 1 above the connector, higher up, and slightly to the left; and 1 over to the left of the blower motor)

Remove the circlip from the blower motor shaft to release the fan from the motor.

Installation is reverse.

Hope this helps you deal with it.

Dec 16, 2009 | 2003 Honda Accord

1 Answer

Replaced blower motor, now runs continuously.


Run's continuously ? High speed , low , med 1,2, 3 . ????
Probably the high speed relay contact's stuck closed . The fuse for the high blower is hot at all times , low blower fuse is hot only with key on. It sparks becaused the motor turns on . If it had a short the fuse would blow . The blower motor relay is part of the resistor pack near the blower motor .

Oct 01, 2017 | 2000 Oldsmobile Intrigue

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