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I have a 3.8 V6 in my mustang.My AC compressor dose not engage.I checked the wire from the compressor too wear it gose into the hornnes.Not getting power.Then I checked the back of the switch.I found the perpple operating wire.I followed it all the way to the passenger side. And moved the clove comparment & side panel.I am getting power all the way to that side.what sould I check next or change.

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Sounds like a bad pressure switch or low on freon; also, try this tess, if the blower is completely dead and is not providing any air movement, the cause could be in the resistor block for the fan motor or the fan motor.

1.- If you have one or more blower speeds, the problem is the Resistor Block. This part (resistor block) controls the various speeds of the blower motor. It is located on the passenger compartment side of the blower housing and can be replaced in few minutes. You can find the part online for around $10.

2.- If you do not have any speeds, you should verify the Fan Motor works by pulling it and connecting it to a 12 volt DC power source. To pull the fan motor, you will have to remove the glove box to gain access to the 3 or 4 screws that hold the fan in place, although I did it without removing the glove box. The motor is attached to a large mounting plate that is at the bottom of the air plenum located behind the glove box. If you look up from the passenger floor you will see the motor hanging down. Once the connector is disconnected and the screws are out, you will have to turn the mounting plate to allow the motor to drop. Keep in mind the position as you pull it down as it needs to go back in the same twisting fashion.

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Posted on May 15, 2010

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