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Ac/heater fan only working on high

Cabin ac/blower fan

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  • Cars & Trucks Master
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There is a resistor group that controls all the other speeds. it is burned up

Posted on Apr 16, 2015

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Posted on Jan 02, 2017

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1 Answer

Blower motor made loud noise and now doesn't work


Hi
yes you are correct, it is the blower motor
make sure that you gonna check the cabinet filter as well
to avoid bits and pieces from going into the blower fan again

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AC/Heater blower fan stops blowing air into the cabin when I accelerate.


Usually a vac leak. I would check for a leak in the HVAC control system and the line thru the firewall to the engine.

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1998 buick century my heater and ac fan only work on high i'm told it's the blower relays where are they located


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The fuse within the cabin is marked blower/fan/AC and it is easily accessible. You need to use a good lamp to check on the face plate of the fuse box on which it is inscribed.

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01- Dodge Caravan AC Heater Control it only works on high none of the speeds work when I rotate the switch from low to high. Is this a swith problem or a motor problem?


Most likely neither. The most common cause is that an electrical device called the blower motor resister block, has failed. This device provides all the slower speeds. It is generally mounted in the HVAC [Heating, Ventilation & Air Conditioning] box, very close to the blower motor. FYI, we mechanics call the fan motor inside the cabin the blower motor. The electric fan motor behind the radiator is called the cooling fan motor.
If the resistor block is OK, then you have either a bad fan speed switch or a melted electrical connector at that switch. 95% of the time, the resister block is the problem.
Charlie

Aug 22, 2011 | 2001 Dodge Grand Caravan

1 Answer

Ac/ heater fan only works on #4 high . is it the switch or the fan itself ? #1-3 nothing . ac is cold and heater is still hot.


u will need to replace the blower motor resistor, it is located next to the blower motor under the hood on the passenger side

Nov 02, 2009 | 2001 Ford Explorer Sport

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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.

Jul 29, 2009 | 2004 Isuzu Rodeo

1 Answer

The ac cabin fan blower is too noisee when in high mode


Yes you can replace it, or you can try cleaning it

May 13, 2009 | 2005 Kia Sorento

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