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Blower motor speeds up and slows down, speeds up and slows down when using air conditioning. Does not do it all the time.

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98 2 dr tahoe no blower and 4 wheel drive light comes on

Posted on Feb 19, 2010

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Does it have an automatic temp sensor which adjust for cabin temp? Maybe that's going bad.

Posted on Jul 21, 2008

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AC fan blows less air after extended use


Sounds to me the blower motor is on it's way out and should be replaced. Even though they sound like there working doesn't mean everything is ok with it there are different parts on it that could go wrong and they way to fix it is with another blower fan and not a bad idea to do the resistor at the same time located in the blower box with about 4 wires coming out of it with one or two screws holding it in place all is located under dash behind the glove box area.

Aug 03, 2012 | 2002 Dodge Grand Caravan

1 Answer

Ac/heater blower motor fluxuates in speeds blows vary slow then quits!


has a short and needs to be cleaned you can buy canned air at wal-mart to try first

Jun 15, 2012 | 1996 GMC Jimmy

1 Answer

2000 jeep grand cherokee, only blow out a little air even when the blower on hi,,you have to put your hand next to the vent to feel the air


you may have had something fall down into the defrost vent and it has worked its way down and is blocking the air flow thats trying to come out the vents,near the blower motor.also does it sound like the blower motor is spinning on high speed or at a lower speed,you could have a slow turning blower motor.

Jul 20, 2011 | 2000 Jeep Grand Cherokee

1 Answer

Blower works only in high on my mitsubishi lancer 2000, what is the cause


The "blower motor resister" that slow the motor down to the slower speeds is broken or burnt out. The motor is running at it's default setting of full speed. The resister is usually located on the blower motor housing so it gets lots of air moving over it (it gets hot). It is held on by two or three screws and when you take it out you will see several different sized coils (one for each speed). Hard to get to easy to replace.

Oct 02, 2010 | 2004 Mitsubishi Lancer

1 Answer

2006 B4 Subaru Legacy A?C blower motor runs at high speed all the time when switched on


blower motors are regulated by group of resistors that cause the voltage to reduce at different amounts resulting in high to low speeds on the fan. When this fails the motors goes to high speed all the time. These are not expensive or hard to replace. Usually a plug connector and a couple of screws and around $25 will do it. These are located under the dash in the main body of the heater as they rely on air blowing over them to reduce the heat created by the resistance. the side opposite the connector will look like sifferent sizes of wire wound much like a spring to create resistance and slow the blower motor down. Once you have this out you can go to a parts store and ask for a replacement one. good luck

Apr 24, 2010 | 2006 Subaru Legacy

1 Answer

How to install a front blower motor in a 96 ford explorer


Blower Motor - REMOVAL & INSTALLATION
(see Figures 1 and 2)

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Fig. 1: Exploded view of the blower motor mounting

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Fig. 2: Exploded view of the blower motor and wheel (fan) assembly

Without Air Conditioning

  1. Disconnect the negative battery cable.
  2. Remove the air cleaner or air inlet duct, as necessary.
  3. If necessary, Remove the speed control module and the washer fluid reservoir.

2587a00.jpg

Fig. 3: To remove the blower motor, first disconnect the electrical wire harness plug...

f234e79.jpg

Fig. 4: ...then remove the blower motor cooling tube from the motor
  1. Disconnect the wire harness connector from the blower motor by pushing down on the connector tabs and pulling the connector off of the motor.
  2. Disconnect the blower motor cooling tube at the blower motor.
3bbd0e1.jpg

Fig. 5: Remove the blower motor attaching screws and the washer fluid reservoir...

8da3ac1.jpg

Fig. 6: ...then slide the blower motor from the housing. Take care to not damage the blower wheel (arrow)
  1. Remove the 2 screws attaching the blower motor and wheel to the heater blower assembly.
  2. Holding the cooling tube aside, pull the blower motor and wheel from the heater blower assembly and remove it from the vehicle.
  3. Remove the blower wheel push-nut and/or clamp from the motor shaft and pull the blower wheel from the motor shaft.
To install:
  1. Install the blower wheel on the blower motor shaft.
  2. Install the hub clamp and/or push-nut.
  3. Holding the cooling tube aside, position the blower motor and wheel on the heater blower assembly and install the 2 attaching screws.
  4. Connect the blower motor cooling tube and the wire harness connector.
  5. Install the vacuum reservoir on the hoses with the 1 screws.
  6. If removed, install the speed control module and the washer fluid reservoir.
  7. Install the air cleaner or air inlet duct, as necessary.
  8. Connect the negative battery cable and check the system for proper operation.

With Air Conditioning
  1. Disconnect the negative battery cable.
  2. In the engine compartment, disconnect the wire harness from the motor by pushing down on the tab while pulling the connection off at the motor.
  3. Remove the air cleaner or air inlet duct, as necessary.
  4. If necessary, remove the solenoid box cover retaining bolts and the solenoid box cover.
  5. Disconnect the blower motor cooling tube from the blower motor.
  6. Remove the blower motor mounting plate attaching screws and remove the motor and wheel assembly from the evaporator assembly blower motor housing.
  7. Remove the blower motor hub clamp from the motor shaft and pull the blower wheel from the shaft.
To install:
  1. Install the blower motor wheel on the blower motor shaft and install a new hub clamp.
  2. Install a new motor mounting seal on the blower housing before installing the blower motor.
  3. Position the blower motor and wheel assembly in the blower housing and install the attaching screws.
  4. Connect the blower motor cooling tube.
  5. Connect the electrical wire harness hard shell connector to the blower motor by pushing into place.
  6. If removed, position the solenoid box cover into place and install the 2 retaining screws.
  7. Install the air cleaner or air inlet duct, as necessary.
  8. Connect the negative battery cable and check the blower motor in all speeds for proper operation.

Hope this help (remember comment and rated this).

Apr 23, 2010 | 1996 Ford Explorer

1 Answer

No heat or air


Check the blower motor speed control resistor pack is ok.
(The resistor pack is usually located in the blower fan ducting in the air flow).
Check condition of electrical connection terminals on the blower motor circuit - these terminals pass considerable current and over time may fatigue overheat and loosen.
Check operation/replace any blower motor control relay,
Check the blower motor will run if +12v directly applied to the blower motor.
Check operation of the blower motor speed control switch is ok.

Oct 08, 2009 | 1993 Dodge Dakota

1 Answer

My air conditioner is not working on my 2002 BMW X-5. The air is cool it just won't blow out.


If there is air moving through the vents most likely the final stage transistor(blower resistor) has failed. It controls blower speed from a signal from the ihka (a/c control panel). the final stage receives the signal from the ihka of the drivers preference blower speed. the final stage pwm (pulse width modulates) the blower motor. which means it turns it off and on very quickly to speed up or slow down the blower motor speed. It isn't the easiest part to replace. Usually at a dealership i would expect to pay somewhere around $600 (including diagnosis)but don't hold me to it. bmw dealerships stand behind their repairs and usually include a warranty with the part of 2 years unlimited mileage.

May 07, 2009 | 2002 BMW 5 Series

1 Answer

Air condition fan only works on high speed, no low speed


You have a bad blower motor resistor. This is located under the dash close to the blower motor itself

Apr 14, 2009 | Chevrolet Colorado Cars & Trucks

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