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The heater/air conditioner fan only works on high

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The resistor network is bad. Go to http://www.alldatadiy.com and get the subscription for your car. (About $20 for a year and completely covers your vehicle from recalls to bulletins to all types of repairs) There you can navigate to the heater electrical area and go to Diagrams/Locations and it will tell you or show you a picture of where the resistor network is, how to fix it, how much it would cost to buy the part, (cheap, by the way,) and anything else you may need to know. Makes Chilton and Haynes repair manuals obsolete.

Posted on Aug 19, 2008

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1 Answer

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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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1 Answer

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Pop the hood, start the vehicle and turn the AC on. Watch the compressor, it should have a center that rotates on an off and you should hear a clicking sound. This is the compressor clutch you are looking at. If the compressor is not doing this, check the fuses for the AC. If the fuses are good, then most likely the high side sensor switch is not working, therefore the clutch never engages and the air never gets cold.

Try that and get back to me, ok?

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