I would suggest taking a look at the blower motor resistor, the resistor might've gone bad. Or another common issue with the blower motor resistor is the harness to the resistor sometimes gets burned. They're fairly easy to access, you just have to remove your glove box and they're directly behind it. While you're there you might also want to pull out your blower motor to inspect and clean it. I had all sorts of debris when I pulled mine out. Good luck!
2008 Commander Limited 5.7L HEMI QDII
Mods: AFE Magnum Force Stage 2 CAI, OME HD Lift w/OME Shocks and Struts, Goodyear Wrangler All Terrains w/Kevlar 255/70R17, JBA Gen 6.7 Upper Control Arms, Hypertech Speedo Calibrator, Magnaflow cat-back system, Custom Retrofit HID Projectors, LED Conversion Kit for Fog Lights, Rigid Industries D2 LED Driving Lights
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