An air-conditioner ECU sets the maximum flowrate or a set flowrate which is less than the maximum flowrate as a required flowrate Vr based on outside air temperature when a DEF mode is selected, and requires that coolant be circulated (steps 100 to 110). Also, when the coolant temperature Tw during heating is between a set temperature TS3 and a set temperature TS1, circulation of coolant at the minimum flowrate is required (steps 134, 130, 132). When a blower fan is stopped when the coolant temperature is equal to or less than the set temperature TS3 and a fresh air mode is selected, the circulation of coolant at the minimum flowrate is required when the vehicle speed Sv is above a set vehicle speed (steps 134 to 146). Cool air is prevented from being blown out of an air outlet and heating of the coolant is promoted by suppressing the speed of an electric pump while maintaining the ability to prevent fogging.