How does a heater work in Holden Barina?

In a Holden Barina, the heater works by circulating warm air into the cabin using the vehicle's engine coolant. When the engine heats up, the coolant absorbs heat and flows through the heater core, which acts like a small radiator. A fan blows air over the heated heater core, distributing warm air into the cabin through the vents. The temperature can be adjusted using the climate control settings to provide the desired level of warmth.