Question about 2000 Buick Century

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Heater fan only works on high

The fan stops on all lower than high settings but runs fine on high

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Replace the step switch, the contacts are burned out or just use it on high until that speed doesn't work...your choice..

Posted on Dec 31, 2012

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Posted on Jan 02, 2017

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SOURCE: 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.

Posted on Oct 25, 2008

honeymokey
  • 3113 Answers

SOURCE: My fan/blower won't run on high setting. It works

Replace relay under blower motor, under hood.

Posted on Jul 06, 2009

  • 534 Answers

SOURCE: why is my heater fan running continous on high

Check for a faulty heater fan relay.
Contacts may be sticking.

Posted on Oct 17, 2009

  • 611 Answers

SOURCE: air conditioner fan barely blowing

blower resistor not the blower

Posted on Jul 22, 2011

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1 Answer

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I own a 2000 E250 extended cargo van. the lower two fan speeds will not work. if i put it on the high setting it runs just fine. is this a switch or fan motor problem


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The heater in my 2002 Dakota works only at the very highest setting. There is no power at the lowers settings. The defrost light doesn't come on until that setting also, so definantly no power. When turned...


I'm assuming you mean the fan only works on high. If that's the case the blower motor resistor is bad. When the fan switch is on high it puts a full 12Volts to the blower motor. When you have the switch in any other possition, the voltage is routed through the resistor and reduced thus making the motor run slower.

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It's very possible the fan motor has quit. The squealing noise is caused from motor bearing failure. As the bearings wear out or dry up the motor is harder to turn and require more current to run the motor. On lower speeds, the motor runs off a series of resistors that reduce the amount of voltage and current so the fan runs a lower speeds. If the bearings are worn, there is not enough voltage or current to turn the motor and that's probably the humming noise your hearing.
Good observation by the way.
Let me know.
regards,

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The heater fan resistor has failed. This is the device that controls the voltage to the fan motor, on the 3 lower speds, The resistor is bypassed when HIGH is selected. It is located under the dash, passenger side, on the box between the heater fan blower housing and the main heater box at the center. Held in by 2 phillips screws. Easy to change.Hope this helps, and Thanks for choosing FixYa. Please feel free to comment back if you have any other questions.

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Ac & heater


Disconnect the wire from the fan, turn the car on, test the voltage between the connector to ground (chasis) on all fan speed settings (high,med,low). If you have voltage at all settings (approx. 12.3V on high and less as the speed setting is lower) then replace the fan motor (about $50 at autozone). If there is not voltage on all speed settings you will also need to replace the blower motor resistor (about $12 at autozone). The whole process takes about 20 mins.

Oct 09, 2008 | 1999 Oldsmobile 88

1 Answer

2005 jeep grand cherokee 4.7 Ac fan lost the 3 lower settings, only the high setting still worked. For a while the lower fan settings would just come on, and then go out again. The high fan setting...


Well, the blower resistor handles the lower speeds and the hi-blower relay handles the hi speed only. if the fan still works on the lower speeds then the resistor is bad. if the fan doesn't work at all then your motor has failed and or burn't the relay out also. if you can get your blower to start by hitting the kick panel above the pass. side foot area then the motor is bad. if you are handy enough to drop the kick panel and access the motor then check the connections at the motor. Then wack the motor and see if it comes on then. you will most likely find the problem if you follow those simple rules above. Good luck.

Jul 31, 2008 | 2001 Jeep Grand Cherokee

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