Automotive Service Excellence (ASE) Air Conditioner Certification Practice Exam 2025 - Free ASE Air Conditioner Practice Questions and Study Guide

Question: 1 / 400

Which of the following describes the function of a blend door in an A/C system?

Directs airflow through the evaporator coil

Mixes hot and cold air to regulate temperature

The function of a blend door in an air conditioning system is to mix hot and cold air to regulate the temperature that enters the passenger compartment. It is a key component in the climate control system of a vehicle. By adjusting the position of the blend door, the system can create a desired mix of air from both the heater core (which may contain hot coolant) and the evaporator (which cools the air), allowing occupants to achieve their preferred temperature setting. This capability is essential for providing comfort regardless of external weather conditions. The blend door's role is pivotal in ensuring that the temperature can be finely tuned to the preferences of the vehicle occupants, demonstrating the importance of precise climate control in modern vehicles.

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Controls refrigerant flow

Regulates fan speed

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