Fan works with low temperature when start

According to how you describe it, I would say there's nothing wrong with your Prius. What settings are you using, and have you read the destruction manual? My Prius is a 2009 Gen II, and I've noticed the system will remember how the A/C, temp, and vent-settings was set last time the system was switched off, so when the system is started up again, it carries on from where it left off although it might change things according to the outside conditions. - hope this helps - Wil (BTW Welcome to PriusChat!)

 

Is the AC on? If your air conditioning is in AUTO then AC is on and radiator fans will run (if temperature is above freezing). If you put air conditioning to manual mode by pressing some blower mode button on screen you can then turn AC off by pressing its button on screen. If you keep air conditioning in manual mode all settings will stay. If your AC is turned off and engine is not hot (unlikely) fans shouldn’t run.

For winter driving I just put the blower to feet+windscreen mode and turn AC off. Then I put the temperature to coldest number (not the MIN).

 

Not quite sure I understand. When you go to the climate control screen, does the climate control actually show "LO" as the temperature setting? Or does it show some other numeric temperature that you want but the air that comes out of the vents is very cold?

The Prius especially in Mongolia will take a long time to warm up, it is an efficient car which means less heat. So if you have it set to a warm inside temperature but it is very cold outside it will take many minutes (10+ minutes) before warm air starts blowing out.