I have a 2002 Jeep Grand Cherokee Limited. Over a year ago my fan went from blowing a lot of air out the vents to nothing. I brought it to our mechanic who said the blower was fine but they replaced the resistor and put in a new wiring harness. When I picked up the vehicle I immediately tried the A/C and knew right then that it wasn't right. The fan used to blow my hair around on high and now I could hardly feel the fan - it felt like it was on low when it was on high. It seemed like I could hear the blower way more than before and getting less air movement. They didn't have an answer for me and said that was all they could do. Could it just be the wiring is wrong? What should I try first? My vehicle has Automatic Zone Controls. Thanks
Welcome to the garage.
This is a known problem. The blower makes a lot of noise, but almost no air from the vents. This is caused by cross installation of the wiring, which causes the blower to run in the wrong direction. Seems that the new harness wires are swapped in the connector. Just swap two wires to the blower motor and it will run ok.
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Thanks for the help. We switched the red and black wires (they were wrong) and immediately the blower came back to life and worked but only on high and even when the car was not running. Apparently some wiring is still wrong. Not sure what wires to change to fix this.