Heating, ventilation, and air conditioning system for vehicle

An air conditioning system for a vehicle, comprising:

• a first coolant line passing through a radiator and having a first end portion connected to a first valve and a second end portion connected to a second valve;
• a second coolant line passing through an indoor air conditioning core and a high-voltage battery core and having a first end portion connected to the first valve and a second end portion connected to the second valve;
• a first coolant exchange line passing through a first heat exchanger and having a first end portion connected to the first valve and a second end portion connected to the second valve;
• a second coolant exchange line passing through a second heat exchanger and having a first end portion connected to the first valve and a second end portion connected to the second valve;
• a refrigerant line including the first heat exchanger, the second heat exchanger, and a compressor, in which coolant circulates;
• and
• the first valve and the second valve are controlled by a controller such that the first coolant line or the second coolant line is selectively connectable to the first coolant exchange line or the second coolant exchange line,
• wherein a bypass line is disposed between the high-voltage battery core and the indoor air conditioning core, coolant being configured to bypass the high-voltage battery core, and
• wherein the bypass line includes a bypass valve, the coolant being selectively supplied to a high-voltage battery core side.