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Dash board Fan knob no to high - Cars & Trucks

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Are you saying that the high fan speed position doesn't work? This is an issue with the resistive relay circuit behind the knob. Replace the switch.

Posted on Nov 05, 2012

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Posted on Jan 02, 2017

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Fan control switch knob only works on high nothing else bad ,cold air,blows fine on high not on low med,how to change out the knob,


I think your resistor unit for the blower motor is bad. It is located on the engine side of the firewall in front of the passenger. There are a couple of videos on youtube on replacing the unit. See the link.
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You can save a LOT of money by fixing it yourself.

All that is wrong with the knob are broken wires from the knob's PC board to the main PC board on the AC control.

All you have to do is remove the AC main control, take it apart, and resolder the broken wires from the PC board with the knob on it, to the main AC pc board. There are 3 wires, any number could be broken.

If you take it apart and solder the broken wires, this WILL fix your issue. Just make sure you put the wires back exactly where they go.

A FIXYA rating (4 blue diamonds) would be most appreciated for my assistance.

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Yes you car has something like a resistor but its called an ATC BLOWER CONTROL MODULE.Its under the dash on the pass side close to the firewall.

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The dash will have to come out for the A/C prob to check the stepper motors and wiring. There are about 6 motors back controling different flaps to control direction of airflow. Once you get the dash out, turn on the car and start working the climate control to see what motors and flap are doing what. Once you see what's happening or not happening, you will know what to do then. about 4 to 5 hrs to take out dash fix prob reinstall dash.
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