740 GLE
- Check operation of air control door at various temperatures. When temperature is less than 41°F (5°C), air control door should be closed allowing only preheated air to enter air intake.
- When temperature is approximately 50°F (10°C), air control door should be open half way allowing preheated and cold air to enter air intake.
- At temperatures greater than 59°F (15°C), air control door should be closed allowing only cold air to enter air intake.