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Our 2003 Buick heater fan will only run at higher speed, on the first or low setting the moror will not run

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Blower motor control modular,,,

Posted on May 15, 2010


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Heater fan control

Change your blower motor resistor

Oct 22, 2011 | 2003 Buick Regal

1 Answer

5 speed fan not working on the three 'low' settings, only on setting four and five.

Given the limited details, I am going to pretend it is a gm/chevy pickup.

There is a resistor pack under the dash on the passenger side (mounted to the heater housing). I would check it first. There is a normally a plastic cover under the dash hiding this area from view.

This part failed on my 2003 Silverado and my symptoms were the same as yours. (not saying that it couldn't be something else). My truck would only blow on the higher speeds and replacing this part was easy and a couple years later it still works on all speeds.

My vehicle had about 80,000 miles when I replaced it.

The new part is an upgraded design and should get your fan speeds back to normal, and hopefully last longer than the original part.

I could see visible burn marks and bubbled up plastic etc. on the failed assembly where some of the resistors had overheated and failed.

These resistors each have different values and therefore offer varius fan speeds. When a particular resistor fails (Low for example) it no longer completes the circuit and that fan speed (Low) dies along with it.

Your fans "High" speed is NOT running through a resistor and therefore does NOT go away with a failed resistor pack.

Good luck!

Let me know if this helps.


Mar 08, 2011 | GMC Sierra Cars & Trucks

1 Answer

Back window won't stay up heater and air fan won't run at two of the lowest speeds low coolant light always on

You need a window regulator for the back door., a fan speed relay for the blower, clean or replace the coolant level sensor.

Feb 11, 2011 | 2002 Buick Century

1 Answer

1996 Buick Park Ave A/C Fan only works on low speed

It is out under the hood ,mounts in the heater case it has 4 wires going to it if your car has manual air and 4 wires coming out if is automatic control air.

Jul 24, 2010 | 1996 Buick Park Avenue

1 Answer

Heater fan only works on "high speed"

All cars are designed with a blower fan motor that pushes air through the ventilation system. This air is processed by a series of vents to direct the air to various positions. Example: heater, air conditioner and defrost modes. Most blower motors are power by a basic electrical circuit that utilizes a multi resistor or a solid-state resistor to control different fan speed modes (low, medium low, medium and high). If the resistor malfunctions it may lose one or more of the lower fan speed settings.
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Mar 02, 2010 | 1999 Buick Century

1 Answer

Heater & ac fan only runs at low speed no matter what the setting

You will need to replace the fan. It is located under the Pass dash tucked in the corner. Not to expensive and you could do it yourself I think there are (3) 6mm screws that hold it in place. Correct me if I'm wrong about the size. Good luck.


Oct 10, 2009 | 1992 Buick Roadmaster

1 Answer

Heater fan not blowing 2003 buick lesebre

u will need to test the fan motor 1st then if it is ok replace the blower motor speed control resistor.

Feb 23, 2009 | 2003 Buick LeSabre

1 Answer

Heater/AC fan does not blow on two lowest speeds.

Your fan uses resistors to reduce the speed of the fan. Hi speed doesnt use the resistors and that is why it runs on hi. Standing in front of the car, all of your heater housing is on the left side of the firewall You will see a connection with about 4 wires That look like they go nowhere. Take the couple screws out and pull it out. You will be able to see the burnt one.Jump out the burnt on and that will give you another speed or two.

Oct 25, 2008 | 2003 Buick Century

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