I drive a 2013 Hyundai Tucson L.
For a while now, the dial controlling the fan speed has been acting up. Often it only works on a single, or two, settings. There are five settings (0, 1, 2, 3, 4). Sometimes the setting it works on changes randomly. Once or twice the knob was stiff and wouldn't turn easily.
On the Google machine I found out there is a blower motor, and a blower motor resistor -- both exposed directly under the glove box. The guy in this video shows how to change them out: https://www.youtube.com/watch?v=b90Io3_MNio
I decided to unhook the power connectors on these first, and clean them using a spray called Revive, advertised for just such jobs. I sprayed the plug and outlet for both the motor and resistor, and plugged them back in after the spray dried nicely. No luck.
Next I decided to hook up my multimeter to the power leading to each of these, and turn the knob to see the impact. At dial 0, 1, 2, 3, 4 the incoming motor power read 4 V, 12 V, 12 V, 4 V, 4 V, respectively. No amperage was detected (odd?).
At dial 0, 1, 2, 3, 4 the incoming power to the resistor read 9 V, 9 V, 0 V (eek!), 9 V, 9 V, respectively. Amperage was 8.9 mA, 63.3 mA, 0 mA, 8.1 mA, 8.1 mA, respectively.
Am I right to conclude I should not buy any resistor or blower motor since the zero volts incoming is weird? This means the problem is in the knob itself, right? Or at least upstream? I saw some videos online how to take apart the radio/climate control panel, should I do that and clean the knob connectors? And if that doesn't work, should I buy a new climate control panel and put that in there? What would you do? Thanks so much!