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faulty blower motor resistor. The low and medium speed on blower motor is
controlled by resistor and its actual speed is high. So because resistor is not
working, blower motors actual speed which is high is working.
can be faulty blower motor or faulty blower motor resistor. Get the blower
motor inspected. If it's faulty it has to be replaced.
blower motor testing and replacing, check the link below: ----
Thanks for the opportunity to let me help. The blower control switch in your vehicle also uses a blower relay. This relay is generally located on the firewall on the passenger side near the heater fan. You can also look in you vehicle owners manual for the location of the blower relay, it may be also be located in the fuse and relay box under the hood. Generally speaking if the highest setting doesn't work on a GM vehicle it is a high blower Relay. This item is not expensive and can be purchased at most all you local Auto parts stores. If you have a Napa, Orielly's, or AutoZone these stores will also likely help you in the location if you are unable to locate this relay. Here is a general picture
The installation of this relay is either to remove from the fuse box, or if located near the heater fan housing then you will need to remove the mounting screws, remove the wiring clip, then reverse to install.
I hope that this has helped you. D.R. Wilkins
it's behind the glove box. here are procedures from autozone.com:
The Supplemental Inflatable Restraint (SIR) system must be disarmed before removing the blower motor assembly. Failure to do so may cause accidental deployment of the air bag, resulting in unnecessary SIR system repairs and/or personal injury.
Disconnect and isolate the negative battery cable, then wait 2 minutes before proceeding with the removal. This will effectively disable the air bag system preventing possible personal injury.
Remove the glove box from the instrument panel.
Fig. The blower motor is located behind the glovebox, behind the blower motor cover
Remove the A/C-heater blower motor cover.
Disconnect the blower motor wiring connector.
Remove the blower motor wiring grommet and feed the wiring through the blower motor housing.
Remove the blower motor mounting screws.
Fig. Once the cover is removed, unplug the electrical connector and push it through the opening in the housing
Fig. The blower motor is secured to the housing with three small screws
Allow the blower motor assembly to drop downward to clear the instrument panel and remove from vehicle.
Place the blower motor assembly into position on the A/C-heater unit and tighten the mounting screws.
Route the blower motor wiring through the blower motor housing and seat the wiring grommet in the hole of the blower motor housing.
Reconnect the blower motor electrical connector.
Install the A/C-heater blower motor cover.
Install the glove box into the instrument panel.
Reconnect the negative battery cable. Check blower motor operation.
Remove the glove compartment liner to gain access to the heater blower motor and blower motor wheel assembly mounting screws.
Use a small screwdriver to remove clip retaining hydraulic damper strut.
Remove four screws and remove the heater blower motor assembly and blower motor wheel assembly from the heater blower motor housing.
Using a new seal, position the heater blower motor and blower motor wheel assembly to the heater blower motor housing with the flat side of the flange near the heater blower motor switch resistor (18591). Install the four retaining screws.
Tape the heater blower motor power lead to the air inlet duct to keep the wire away from the blower outlet during installation.
Install the heater blower motor and blower motor wheel assembly in the vehicle.
The Blower Motor Resistor is located on the passenger side firewall, not far from your A/C's H-Valve (or expansion valve), going inside of the vehicle. The blower motor resistor has a 4 or 5 way black connector plugged into it and this is the only visible portion of the Resistor you will see. Remove the wiring connector and remove the 2 or 3 screws with an 8 mm or 5/16" socket (8 mm and 5/16" are the same). Once the screws or fasteners are removed, just pull the blower motor resistor out of the firewall and if you look at it, it will have various coils of wire on it, sometimes it will show burnt coils, but you can always check the various coils with an Ohm-meter.
Aside from that, install the new Blower Motor Resistor and Voilà! Your inside Blower Motor should work just fine.
A brief note here, if your fan doesn't work when the fan switch is on High, then it's not the Blower Motor Resistor, but possibly the Blower Motor itself. Should this occur, please get back to me insofar as how to replace the blower motor and why the blower motor's wires have to be twisted...even with the new blower motor fan.
I dont know what these other guys are saying..I think they snif the glue!!! YOUR BLOWER FAN ASSEMBLY CAN EASILY BE REMOVED !!
1. Remove the wire
2.Find the "tab on the housing and pull it down while rotating the fan housing counter clockwise. This will remove the fan assembly. Plage 12 volts on the contacts to test the motor. If it works then the resister pack is blown. On the fan housing (near firewall ) you will see a plug going into a square looking box with a screw in it. Remove the wire then remove the screw to remove the resistor pack.. A new resistor pack is around 20 dollars at a ford dealer. Hope thie "FREE" info helps!
I suspect you also checked the fuses, some vehicles are double protected, especially since you usually have to remove the entire dash panel to get to the heater fan blower motor. It should be in the middle or under the glove box, should be located in a plastic box that has like a bell shape to where the motor is. check fuses then check wiring, and make absolutely certain the relay was the correct one that you changed, in a 3 year old vehicle the fan motor should not be bad yet.
The blower motor resistor is located in the heater box area, which is under the dashboard on the passenger side. You will find the resistor in the large squarish tube that leads to the center of the dash from the blower motor housing (right to left on an american vehicle). Unplug the large black wiring connector, remove the 2 phillips screws and the resistor is ready to pull out of the heater box.