Automatic Hot Air Intake
- Visually inspect all hoses and connections for cracks, leaks or damage. Remove air cleaner cover. On Pickup models, cool the thermal valve by blowing compressed air on it. On all models, when engine is cold, check that the air control valve closes the cool air passage at idle.
- Reinstall the air cleaner cover and warm engine. Check that the air control valve opens the cool air passage at idle. If system does not respond properly at given temperatures, check air door or linkage for binding. Replace thermal valve or HIC valve as necessary.
HOT AIR INTAKE SYSTEM OPERATING TEMPERATURES
| Application | Closed Temp. °F (°C) | Opened Temp. °F (°C) |
|---|---|---|
| Pickup | 86 (30) | 113 (45) |
| Tercel Sedan | 79 (26) | 93 (34) |
| Tercel Wagon | 72 (22) | 84 (29) |
| Corolla (Carbureted) & Corolla FX | 72 (22) | 84 (29) |