Evaporator frost prevention control logic for front and rear integrated HVAC system

摘要

An HVAC system for a vehicle includes a housing, a front HVAC unit with a front blower, and rear HVAC unit with a rear blower. The front and rear HVAC units are housed in the housing. The front blower generates an airflow through a front airflow path and the rear blower generates an airflow through a rear airflow path. A separating wall separates the front airflow path from the rear airflow path. The HVAC system further includes an evaporator with a first portion and a second portion. When the rear blower is switched to an OFF position, the rear HVAC unit automatically operates the rear blower at a minimum voltage so as to continue to generate airflow through the second portion of the evaporator.