1. Intake Manifold: The intake manifold is where many vacuum lines connect to. Look for the vacuum lines connected to the ports on the intake manifold.
2. Throttle Body: The throttle body also has several vacuum lines connected to it. These lines control functions like the idle air control valve and the fuel pressure regulator.
3. Brake Booster: The brake booster is located near the firewall and has a vacuum line connected to it. This line supplies vacuum to assist in braking.
4. EGR Valve: The EGR (Exhaust Gas Recirculation) valve is connected to a vacuum line that controls its operation.
5. Fuel Pressure Regulator: The fuel pressure regulator is usually located on the fuel rail and has a vacuum line connected to it. This line helps regulate fuel pressure.
6. PCV Valve: The PCV (Positive Crankcase Ventilation) valve is typically connected to a vacuum line that routes crankcase gases back into the intake manifold.
7. Cruise Control: If your Aerostar has cruise control, there will be vacuum lines connected to the cruise control components, such as the vacuum reservoir and the cruise control actuator.
8. Transmission Control: Some models may have vacuum lines connected to the transmission control system, particularly for models with an automatic transmission.
It's important to note that the specific locations and configurations of the vacuum lines may vary slightly depending on your Aerostar's engine type and trim level. If you need to disconnect or replace any vacuum lines, it's recommended to refer to the vehicle's repair manual or consult with a qualified mechanic to ensure proper identification and routing.
