Kia lion running does not turn on the hot air conditioner at idle speed, only when refueling.

There should be two situations in this. One is to remove the thermostat of the vehicle engine and not install it, resulting in a large circulation of the cooling system. When idling, the displacement of the water pump is small, and there is not much hot coolant in the heater box, which leads to the idling heater not being hot. Another situation is that. The thermostat is installed, the heating box is dirty, and the hot coolant can't be heated when idling. I hope my answer can help you, and I hope you can adopt it. Thank you!