To be more specific, look for:
* Location: The throttle body is located on the intake manifold, usually near the air filter housing. The IAC valve is either integrated *into* the throttle body itself (common on many vehicles, possibly yours) or bolted directly onto it.
* Appearance: It's small, maybe 1-2 inches in length and about an inch wide or less. It will have a single or multiple wire electrical connector plugged into it. It might have a small, possibly threaded, opening for airflow control. It won't have any visible moving parts externally, other than possibly the connector.
* Note: Some IAC valves might have a different color, but black is quite common. It might also have some markings or numbers stamped or printed on it.
To be absolutely certain:
1. Consult your owner's manual: It might have a diagram showing the location.
2. Use a repair manual or online diagrams: Search for "1999 Ford Expedition IAC valve location" with images. This will provide visual references specific to your vehicle's year and engine.
3. Use a parts catalog: Enter your vehicle's details into a reputable online parts catalog (like AutoZone, Advance Auto Parts, or RockAuto). The diagrams often show the location of parts.
Don't rely solely on this description. Using the additional resources listed above will ensure you locate the correct part. Incorrect identification could lead to unnecessary repairs.
