Question about 2005 Chevrolet Silverado

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Air conditioner fan works on all speeds except on high. every once in a while it does work on high

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It is the fan switch..

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Posted on Jul 31, 2009

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2 Answers

How do you know if your blower resistor is bad?


Unlikely a blower motor resistor problem. If the resistor is faulty. the fan speeds will not work/fail on the lower speeds. High speed will normally always work. If the fan is non operational suspect a fan motor issue.Bad fan motor/switch/wiring to it

Jul 22, 2015 | Cars & Trucks

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Why does the air conditioner on my 2003 nissan altima only work on position 4?


If you mean the blower only works on high, it could be the resistor that cuts down the power for the other speeds.

Jul 07, 2013 | Cars & Trucks

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Heater / air conditioner fan control doesn't engage fan. Previously, it only worked in high speed.


I would replace the blower motor resistor first then see if that corrects this. The resistor is located next to the blower motor under the dash.

Jul 16, 2012 | Cars & Trucks

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Air conditioner works great, but is stuck on high


just need to replace the switch not to familiar with how the assembly comes out but should just be the switch you may be able to pick it up at a parts store but it may be a dealer part

Jul 25, 2010 | 2002 Mercury Sable

1 Answer

Air conditioner wont turn on


It might be the fuse for the AC compressor. Check to make sure the blower motor/fan is working by putting it on heat, or vent and adjusting the level from low to high (not temperature). Fan speed. Hope this gets you started.

Apr 03, 2010 | 2006 Hyundai Sonata

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

My Air conditioner only works on high


The switch that runs the blower motor for air and heat sends the DC voltage through some big resisters when it isn't set on high. (On high it sends all the power to the motor.)
If the lowest speed doesn't work then one of the resisters has gone bad, or come disconnected. If more than 1 speed doesn't work then a differant resister has gone bad or disconnected. The power runs through each resister in series so the most common one to go bad is the second to highest speed. when this resister is bad thaen it will only work on the highest setting. Replacing the switch won't fix it. You will have to find the resister that is bad and replace it.
The resister bank is usually tucked up behind the dash where only a kid can focus his eyes, and contort himself enough to see it.
Once the resister is replaced it should run perfectly.
Presto.

Aug 26, 2009 | 1998 Mercury Mountaineer

1 Answer

Air conditioner blower only works on high speed


Blowing air at high speed only indicates that the fan controller is dying or the fan itself is dying. Have a mechanic check this out.

Jul 12, 2009 | 2003 Toyota Corolla

1 Answer

I have a 1996 Cobra SVO SVT that the high speed


ok. so you know the fan is good. switch out the relay for that fan with another same relay and check with the a/c button.

Jun 26, 2009 | 1996 Ford Mustang

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