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Tuesday, March 31, 2009

2005 Chrysler 300 No Blower

Hi Sparky,

 I have a 2005 Chrysler 300 with manual a/c and the blower does not work. I have taken the motor out and checked it with a battery and some wires and the motor works. What should I check next?

 For testing power at the blower motor, I recommend that the engine be running. Set the parking brake and make sure the transmission is in park. Now with a test light or a volt meter check to see if you have power at the dark blue wire at the blower motor. If you do not have power at the dark blue wire check the 30 amp fuse #42 in the right rear of trunk. If there is no power there with the engine running I will have to give you a test for the run relay. If there is power there, then go to the blower resistor and check for power on the black w/light green wire, with the blower motor connector plugged in and the engine running. If there is power there, you will need to unplug the resistor and check for ground signals at the harness connector coming from the blower switch. You should see a ground signal on the wires as follows: dark blue w/brown on low speed, dark blue w/orange on medium 1 speed, dark blue w/violet on medium 2 speed and dark blue w/yellow on high speed. If you have all of the switched ground signals then the resistor is bad. If you do not have switched ground signals I will have to give you a test for the blower switch.


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