Adjustable grill shutter system

1. A method of adjusting a grill shutter system for a vehicle, comprising:

during a driven vehicle condition, closing grill shutters located at a vehicle front end opening to reduce engine cooling when engine temperature is below a threshold temperature; and

during a non-driven vehicle condition, opening the grill shutters to pre-cool vehicle components when engine temperature is below the threshold temperature, the non-driven vehicle condition being braking or deceleration.

2. The method of claim 1 , further comprising receiving intake air through the one or more grill shutters, and wherein opening and closing the grill shutters includes adjusting an amount of intake air directed to an engine compartment.

3. The method of claim 1 , wherein the non-driven vehicle condition includes a tip-out condition.

4. The method of claim 1 , further comprising detecting a subsequent acceleration and adjusting opening of the grill shutters based on engine temperature.

5. The method of claim 4 , wherein adjusting opening of the grill shutters includes decreasing opening of the grill shutters.

6. A method of adjusting a grill shutter system for a vehicle, comprising:

adjusting opening of one or more grill shutters located at a front end opening of the vehicle based on engine temperature and vehicle deceleration, including:

during a vehicle deceleration condition with the vehicle moving, opening the one or more grill shutters located at the vehicle front end opening to pre-cool vehicle components when engine temperature is below a threshold temperature; and

during a driven vehicle acceleration condition with the vehicle moving, closing the one or more grill shutters to reduce engine cooling when engine temperature is below the threshold temperature.

7. The method of claim 6 , wherein engine temperature is a coolant temperature.

8. The method of claim 6 , wherein vehicle deceleration includes braking with vehicle brakes being engaged.

9. The method of claim 6 , wherein vehicle deceleration occurs responsive to a driver tip-out.

10. A vehicle grill shutter system configured to direct intake air received through grill shutters to an engine compartment of a vehicle for cooling components therewithin, the vehicle grill shutter system being communicably connected to a controller having instructions stored thereon and executable to:

determine, via the controller, a vehicle braking condition;

during a driven vehicle non-braking condition, closing grill shutters located at a vehicle front end opening to reduce engine cooling when engine temperature is below a threshold temperature;

during the vehicle braking condition, opening the grill shutters to pre-cool vehicle components when engine temperature is below the threshold temperature.

11. The vehicle grill shutter system of claim 10 , wherein the instructions are further executable to determine, via the controller, a coolant temperature, and to adjust opening of the grill shutters based on the vehicle braking condition and the coolant temperature.