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1998 Toyota Avalon HVAC Blower not working properly

The HVAC blower does not run or runs is running at very low speed. When I change the fan speed buttons there is no difference in fan output. I am not sure if this is the fan motor or something to do with the automatic temperature control or the fan speed buttons. Any thoughts? Please advise.

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  • Anonymous Apr 21, 2009

    Exactly same problem as mentioned by tsmith62

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5 Suggested Answers

SOURCE: blower works. However, only at one speed: LOW. no matter if set at low, medium, or high.

After two summers of sweating under the sun, it's fixed!!! There were two wires which looked like ground wires right above the glove box. One of the two wires was almost totally severed due to an overstuffed glove box. I guess every time I open and close the glove box, paperwork in the glove box push the wire up and down. It's like bending the wire back and fourth. Over time the 2-3 mm thick wires slowly sever. Upon inspection, my wires only had 3 strands holding it together which explains the fan staying on the low position due to slow ground. I re-attached the wires and soldered them back into place. Now my AC works like new - thanks to Mathew the Mechanic.. Thank you for asking. I really hope this posting helps someone with the same unique problem.

Posted on Aug 23, 2008

  • 1861 Answers

SOURCE: Heater Blower Motor

Remove the glovebox door, and the under dash cover/trim panel.

Look behind where the glove box was, you will see the heater box

At the bottom of this box, there is a round plate with a wiring connector and 3 screws holding this plate to the heater box.

This plate is the bottom of the heater fan assembly; remove the connector, and the 3 screws. The fan motor will drop staright down. Real easy to do.

Posted on Oct 21, 2008

Charlie1221
  • 61 Answers

SOURCE: 04 Chevy Trailblazer HVAC Blower Problem

This is the first time I have heard of this problem. It's not to say it's not common. Try the salvage yard first obviously cause its cheaper. If problem presists contact the dealer for advice.

Posted on Jan 27, 2009

  • 1 Answer

SOURCE: hvac blower motor not working

replace the "blower motor resistor" located next to the blower motor

Posted on Apr 24, 2009

  • 57 Answers

SOURCE: Air conditioner/heater blower fan on 1997 Buick

it will be hard to diagnose with out having my hands on it but try this.

this vehicle is known for blower motor resistor failure.

under the dash on the passenger side next to the blower motor there is a resistor attatched to the blower motor case it will have a single plug with 5 or 6 wires in it, they are normally within a couple of inches of the blower motor, remove this resistor and look at closely for any signs of burning this is a common problem, you can buy one at any parts house, do not operate the motor with the resistor removed from its mounting hole or you will damage it.

if the resistor looks good than purchase you a test light and drop me a line and i will explain how to test the entire system its not hard to do.

wesleyschacht@hotmail.com

Posted on Jun 14, 2009

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1 Answer

Missing variable control voltage on the blower fan control module on a 2008 Buick lucerne


What are you using to test this control signal ? Were you on right wire ?
Blower Motor Control Processor The blower motor control processor is an interface between the HVAC control module and the blower motor. The blower motor speed control, battery positive voltage and ground circuits enable the control processor to operate. The HVAC control module provides a pulse width modulation (PWM) signal to the control processor in order to command the blower motor speed. The processor supplies 12 volts to the blower motor through the blower motor voltage supply circuit. The control processor uses the blower motor ground as a low side control to adjust the blower motor speed.

Chevy Trailblazer EXT Blower Motor Won Turn Off The blower motor in this video don't shut off , but he show's how to test the PWM signal right !
Your blower motor control module is probably bad , or HVAC control panel is bad , or a wiring problem !

Sep 26, 2016 | 2008 Buick Lucerne CXL

1 Answer

3 speed fan barely changes speed


You are talking about your blower fan for the air conditioner and heater right? More information will be needed to solve the problem.

When you say it barely changes speeds, does that mean it doesnt speed up, or doesnt slow down? By that I mean, is it "stuck" on low, or high?

Most blower fans run at different speeds through the use of a multi-stage resistor built into the fan switch circuit. Low speed is a high value resistor, medium speed is a low value one, and high speed is the fan running without any resistance.

If your fan is running on high and doesnt seem to want to run on lower speeds, the resistor pack may be failing. If the fan is running on low speed only, it may be that the fan itself is beginning to fail, or that the lubricant in it has gotten gummy.

Dec 07, 2015 | Cars & Trucks

1 Answer

Have plenty of heat and I know fan works but fan only blows on low speed


The blower motor resister(s) is burned up.
3 settings? The higher setting resistors are an open circuit.

Mar 02, 2013 | 1998 Toyota Avalon

1 Answer

1992 chevy C1500: Heat works on low speed, no medium, and high only works intermittantly.


On any other vehicle it sounds like the blower fan switch.
The fan switch provides power or ground to the resistor and there would be a high speed blower relay to bypass the resistor.
But in your case the fan switch is part of the controller.
I don't have a diagram for a 92 but the 94 model shows relays for low medium and high speeds. Each relay gets power from a fuseable link. The high relay gets power thru the low relay if the low relay is not engaged.
If you have the model with 3 relays you may need to check them.

Feb 01, 2013 | 1992 Chevrolet C1500

1 Answer

1998 toyota avalon xls. No heat, no a/c, no defrost, no fan/blower. Lights on the control display sometime work. Is this the a/c amplifier?


so for that issue you will have to replace your blower motor for sure and you might have to change you resistor it should nt be complicated good luck

Jan 05, 2011 | 1998 Toyota Avalon

1 Answer

Where is the blower motor? heater in car dosent blow. not under hood, cant get through glover compartment.


This work for 1998 Buick Century 3.1L SFI OHV 6cyl; the blower motor is a variable speed motor. The higher the voltage applied to the motor, the faster the speed. Depending on the HVAC (Heater Ventilation Air Conditioning) option installed in the vehicle, blower speed control could be through a set of resistors or through a solid-state blower motor control module.

In general, this system is reliable. Because so many of the control operations are electronic, special diagnostic equipment really should be used for system diagnostics and check-out. An authorized technician using a scan tool can most quickly locate HVAC problems.

zjlimited_78.jpg

Fig. Typical behind-the-instrument panel view of HVAC related components. Depending on the HVAC option, not all components are used on all vehicles (click for zoom)

zjlimited_79.jpg

Fig. Typical HVAC operation schematic

An inoperative blower motor could be caused by the following:

* Blown fuse(s). The fuse should be replaced. There may be both a LOW BLOWER and HIGH BLOWER fuse. Some models may also call it the HVAC fuse. Even the RADIO fuse is used in some applications. Check them all. If a fuse is blown there may be a short to ground in one of the power supply circuits.
* Open Circuit. Check the circuit between the ignition switch and the blower motor, and the blower motor ground circuit. Repair as necessary. * Faulty blower switch. A faulty blower switch should be replaced. * Most heater blower circuits also include a blower motor relay (look in the underdash convenience center), as well as a blow motor resistor. These items should be checked especially if the blower runs in one or two speeds, but not all speeds selected.

REMOVAL & INSTALLATION

  1. Disconnect the negative battery cable.
  2. The blower motor is located on the passenger side of the vehicle, under the instrument panel. Remove the right side sound insulator (trim panel) by removing the retainers and disconnecting the courtesy lamp.
  3. Detach the blower motor electrical connector. Some applications may have cooling hose to the motor which should be disconnected.
zjlimited_80.jpg

Fig. Blower motor and fan assembly removal

  1. Unfasten the blower motor mounting screws, then remove the blower motor from the vehicle.
  2. If the blower motor fan (also called a 'squirrel cage') must be replaced, use the following procedure:
NOTE Do not hammer on the motor to remove or install the fan. Do not apply force to the motor housing to seat the fan on the motor, or motor/shaft bearing damage could result. Do not apply pressure to the fan rim. Be sure the correct replacement part is used.
  1. Remove the metal star clip retaining the fan cage to the motor shaft.
  2. Remove the fan by pulling straight out.
To install:
  1. If removed, install the blower motor fan, as follows:
    1. Install the replacement fan cage onto the motor shaft.
    2. Adjust the fan cage to get a clearance of 0.30 inch (7.5mm) to the motor mount plate.
  2. Install the remaining components in the reverse of the removal procedure. Make sure the electrical connection is secure. Tighten the motor screws to 14 ft. lbs. (20 Nm).
  3. Connect the negative battery cable, then test the blower motor for proper operations


I hope this helps (remember to rate and comment this answer).

Nov 17, 2010 | 1998 Buick Century

1 Answer

MY HVAC fan stopped blowing. Checked all the


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 | 2003 GMC Sierra

1 Answer

HVAC blower don't run at medium speed


the blower switch is defective or the medium speed coil inside the blower motor is open(cut off). no worry if the low and high speed are still functioning

Aug 09, 2009 | 1990 Mitsubishi Sigma

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