Hot Air Intake System - Automatic: Description

The Hot Air Intake (HAI) system adds hot air to the carburetor in cold weather to improve driveability and prevent carburetor icing. The carbureted Corolla and Tercel models use a Hot Idle Compensation (HIC) valve to control the opening and closing of the HAI diaphragm. Pickup models use a thermal valve to operate the HAI diaphragm.