When driving a Challenger it’s easy to take for granted how the HVAC system actually works. To us, we hit a switch on the dash to control the settings and let the car do the magic.
When that switch is hit a series of things must happen in order to control the climate in the cabin. If something goes wrong it’s easy to be taken off guard. If you take the time to understand how each component in the system works it becomes much easier to pinpoint the issue and approach a repair.
Blower Motor: The blower motor is the component responsible for pushing air through the vents. When the unit is engaged a fan is activated. This fan pushes air through the ventilation system carrying with it the air temperature you tell it to.
Ventilation System: As the blower motor pushes air the vents direct the air to the point of the cabin desired. The dash controls allow you to shut dampers to help direct the air through the appropriate vents in order to defrost the windshield, warm your feet, or push cool air throughout the entire cabin.
Evaporator Coil: The evaporator coil is used to take advantage of the refrigerant’s extremely low boiling point. The compressor on the engine sends refrigerant to this unit where it boils at low temperature. The boiling of the liquid pools the warm air out of the surrounding area and only cool air is left. This is how air conditioning systems cool air before it sent through the Challenger’s vents with the blower motor.
AC Condenser: After the refrigerant has boiled in the evaporator coil, the AC condenser is used to return the vapor to a liquid state. This liquid refrigerant is then sent to the compressor on the front of the engine where the cycle begins again.
Heater Core: The heater core requires the least amount of contributors to work properly. The heater core uses hot coolant from the engine to give us heat. As the hot coolant passes through the heater core the air around the unit is heated up, and that air is then sent to the cabin of the Challenger.