Question about 2003 Buick Century

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

Heater/AC fan has four speed settings. It does not blow when set on either of the two lower settings.

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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

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Haier commercial cool portable ac unit makes super high pitch noise on all settings & returning it for repair is not an option what troubleshooting steps can I take? Ac blows cool & fan runs at...


It may be the bearings in the motor are dry or out. You coulod pull the motor and fan assembly out and check its operation while it is out of the heater case. Look for anything inside the heater cavity where the motor sits for any problem hindering motor operation.

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My ac/heater fan stops blowing then it blows sometimes? The air is still cold just not blowing out. when it does blow it is cold.


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The heater/ac fan on my Toyota Highlander only runs on high. When set at any of the lower settings, it is just 'off'. Is this a problem with the circuit panel that controls the entire heating/ac system?


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My interior fan (air conditioning fan) suddenly doesn't work on positions one (lowest) and two, but works fine on positions three and four. What gives?


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1 Answer

I own a 2005 jeep liberty. the ac, heater fan only works on selector switch setting # 4. nay sugesstions on why fan does not work on settings 1, 2 or 3.


The lower speeds are accomplished by running the power supply through various resistors that drop the voltage which makes the blower turn at different speeds. The lowest setting uses all the resistors to drop the voltage as much as possible to turn the blower as slow as possible. High speed uses no resistors so the blower gets full power and turns as fast as possible.

Since speed 1 and speed 2 use the speed 3 resistor to drop there voltage and speed three is not working as well my guess is the speed three resistor is burnt out in the device referred to as the blower motor resistor or blower motor speed control module. This is located near the blower motor and is held in place with 2 screws. There will be several wires and possibly two connectors plugged into it.

These are really common failures in many vehicles. The parts are usually available at your local auto parts store and they are typically not that expensive.

Hope that helped.

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2002 Honda Odyssey fan only works at high speed. The A/C compress


Usually when the blower fan only operates on hi speed, its because of a failed blower motor resistor. You still have hi speed because on hi, the power going to the blower motor goes directly to it, as opposed to the lower speeds, when the power is routed through the resistor, thus lowering the voltage, which in turn lowers the speed of the fan. The resistor is usually located near the blower motor itself, under the hood back near the firewall.

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Subject: 2004 isuzu rodeo...my ac/heater blower is not working


The resistors are in circuit only on the lower fan speed settings.
On the highest speed setting, power is switched directly to the fan motor.
Check fan power supply fuses,
Check power is available to the fan when high speed selected.
If all above OK, apply power directly to the motor to verify fan motor runs- if it doesn't the motor may need replacement/repair.

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1 Answer

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fan speed controler could be bad, fan motor rellay could be bad.

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