Heating And Ventilation: Notes

The heating and defrosting system has the following features:

• Controls the temperature and, during A/C operation, reduces the relative humidity of the air inside the vehicle
• Delivers heated or cooled air to maintain the vehicle interior temperature and comfort level
• Cooling or heating can be adjusted to maintain the desired temperature
• System uses a reheat method to provide conditioned air to the passenger compartment
• The blower motor draws outside air through the air inlet duct from just below the windshield during all system operations except for MAX A/C cooling (when recirculated air is used)
• All airflow from the blower motor passes through the A/C evaporator core
• Regulates the temperature by reheating a portion of the air and blending it with the remaining cool air to the desired temperature
• The temperature blending is varied by the air temperature blend door, which regulates the amount of air that flows through and around the heater core, where it is then mixed and distributed
• Engine coolant flow through the heater core is prohibited by the heater control valve when the system is set to MAX A/C (manual climate control), or as determined by the heating ventilation air conditioning (HVAC) module in the AUTOMATIC mode (electronic automatic temperature control [EATC])