Question about 2005 Hyundai Sonata

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Blower fan will not change speed or turn off and seems to be stuck in the 3rd highest position. Even when you turn the automatic climate control to the off position the fan continues to blow. Changing mode or temp has no effect. The only time the fan stops is when the ignition switch is turned off.

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Switch needs replaced in dash. you will have to take it out of the car and put a new fan switch, should work in all positions, and since its stuck that would be what I would replace first, not sure on procedure. http://hyundaisonata.com

Posted on Feb 18, 2010

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Pinpoint Test Q: The Blower Motor Does Not Operate Correctly - EATC
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Troubleshoot Automatic Climate Control System

www.aa1car.com/library/automatic_climate_control.ht
Once you set a temperature on your car's automatic climate control system, ... you turn down the blower speed or change the position of the temperature setting. ...codes (which ordinary engine-only scan tools cannot), and a digital voltmeter to ...

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Yes its the blower motor resistor.

More then likley theres some trash or something in it, or possibly the motor itself is on it's way out. There not that bad to pull out of that body car, just pull it out and see what you can see.

The blower motor is under the glove compartment

You can replace the resistor on your own. Please find a detailed diagram which would guide you to do it.

http://autorepair.about.com/library/images/bl629a-lib.htm

Thanks

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ProTip: Your car is known as an "E36" body style. If you're Googling problems and you want to get to high-quality answers from people who own the same car and have probably dealt with your same problem, search for your symptom using the term "E36".

The classic symptom of a blower resistor failure is that the fan works on the highest speed, but not on some or all lower speeds. This is because the blower resistor is bypassed on the highest speed. You say your fan is intermittent on the highest speed, so it's unlikely to be the blower resistor.

If you have a "display" on your climate control (versus three large rotary knobs and no display), then your car also has something called a "Final Stage Unit" which is an electronic part that the system uses to change the motor speed. You may not even have a blower resistor in this case.

It is possible that the motor itself is bad, but generally these motors fail by becoming noisy, or they sieze up, or die altogether. They don't typically start and stop randomly. However, you can test this by connecting a test light or voltmeter to the motor when the problem is occurring. If there's 12vdc there but the motor isn't running, then your motor is bad. If there is no power there when there should be (i.e. fan is turned on), then the problem is elsewhere.

Or you can take a gamble and replace the final stage unit. Google "E36 Final Stage Unit" and you will find step by step procedures.

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