I had checked the wires at the blower resistor and there is power in the red wire but could not seem to get power from the little purple/white wire. Am I doing something wrong in my testing of this wire? My thoughts are that my HVAC control module has an issue. Could I be mistaken. When testing the smaller wire what setting should have I been on. Volts or Amps? I tried it at high and low setting and nothing. Thanks for your answers people. I didn't realize that when testing the little purple/white wire it has to be back probed to test it. Unplugging and testing it won't work because it is pulsed.
Resistor or the switch is bad.
Test the switch itself.
Testimonial: "How would you test that. I thought I was with the small wire."
There is a resistor in the fan circuit to give you different speeds and it burns out. It's down by the fan on most cars.
Testimonial: "Thanks. It was the resistor not feeding the blower."
SOURCE: 2005 Crown Vic climat contr fan not working Fuses good Motor good
does it have a digital control panel? As this uses an electronic blower speed controller located at the engine compartment (rear engine block) fix on ac phlenum try to shake the connector or wire while the system is on.
SOURCE: My 2003 GMC Yukon XL
Disconnect the module and power the motor direct from the battery and see what happens.-----------The problem is the blower motor control module is shorted. This is a common concern these trucks. The blower control module is located next to the blower motor. It has 2 wires that come out of it and goes to the blower motor, it also has a small wire harness going in to the module. If you unplug this module, the blower will stop. You need to replace this module to repair this issue. The module is plug and play, no programing needed. This module have one plug that goes into the unit and two wires going out of it to the blower motor with two mounting bolts and two silver plates on the othe side of it. ------ click this link below for voltage checking to blower motor controller:--- http://technoanswers.blogspot.com/2011/09/blower-motor-not-running-properly-on.html --------- This will help.Thanks.Helpmech.
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Usually the first thing to inspect when the blower fan stops working is the fuses to see if any are blown. Locate the 10A cluster fuse or the 25A HVAC fuse in your car manual, and examine them to determine if they need replacing. The car owner's manual will tell you where to find the fuses that are connected to the heat and/or air conditioning. On the interior fuse panel of the car, a 30 amp fuse is labeled "Heater" or "HVAC."
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