Air Dams and Fan Shrouds
Airflow through the radiator and condenser is vital for engine cooling, air conditioning, and heater performance. The fan shroud should be inspected and replaced if it is damaged or fits improperly. The shroud and its accompanying air dams are responsible for 10% to 30% of the system's performance. Air shrouds and dams create a low pressure behind the radiator and high pressure in front, drawing cool air through the condenser and radiator fins. A missing fan shroud could reduce cooling by a massive 50%. This part directs airflow but also protects the fan and the technician working near it.
The fan shroud improves airflow at low speeds and idle. Air dams improve airflow at highway speeds. They're not just for scrapping curbs; they direct airflow and create a low-pressure area that cools the radiator and condenser at highway speeds. The airflow created by vehicle movement is considered ram air because it's forced through the condenser and radiator by vehicle movement and speed. Check these parts to ensure that they are installed and fastened correctly.