When I press the button on the climate control that controls the fan speed, it doesn't turn on the blower motor. there is no cold or hot air blowing. When I put power directly to the blower motor then it works. I also tested for power at the with a test lead, and there is power at the connector. I tried replacing the AC relay and the blower motor resistor, and the blower motor started working again but stopped working after I shut the car down and started it again. I checked all fuses and they are okay. I also tried getting a used climate control module and replaced it but the fan speed buttons still do not turn on the blower motor/change its speed.

(For reference, I am talking about the bottom right button with arrows on it as in this picture: https://i.ebayimg.com/images/g/~QYAA...KH6/s-l500.jpg)

Any tips on diag or repair if anyone has experience with this issue would be much appreciated!

 

I'm having a very similar issue with my 01 I30 but haven't tested or replaced any parts yet. The AC itself is working fine but no air movement. It will periodically start working and then stop without warning.

 

Intertesting. I'm still looking into this issue so I will update you if I get it to work again.