I have question about DC blower motor in typical automobile air conditioner. Some circuit have variable resistor that control speed of blower motor. This make more air blow on high than blow on low. I like to know if voltage across blower motor change or current through motor change to make air flow more or less when you change fan speed on panel control. My guess voltage stay same and current adjusted to make more or less air out. I ask question on other thread and no response. Thanks for help. I hope you can help me. If you not know answer please give me link on website and I read myself. Thank you kindly.