It takes me about 20 minutes to get to the blower and the regulator. I'll bet the brushes on your blower are shot. At least that would be where I would start looking. The regulators rarely let go. You will need some guidance on removing the plastic, cowls, windshield wiper, snaps, etc..
2000 Dodge Grand Caravan SE
No matter what you fix, there will always be something else to fix..
"Warranty" is just another way of postponing the inevitable.