* Most likely location (for many models): The speed sensor is often located on the differential housing. It's a small sensor with a single wire connector. You'll likely find it on the passenger side of the vehicle, near the rear axle.
* Other possibilities: In some configurations, it might be on the transmission itself.
To find it definitively:
1. Consult your vehicle's repair manual: This is the most reliable source. The manual will have diagrams and clear instructions showing the exact location.
2. Use a wiring diagram: A wiring diagram for your specific Astro (year, engine, drivetrain) will show the speed sensor's wire and its connection point. These can often be found online through repair sites or forums.
3. Trace the wire: If you can locate the connector for the speed sensor wire (it's usually a single wire from the transmission or differential area) inside the vehicle, you can trace the wire back to its source. Be careful not to damage any wiring while doing this.
4. Check online forums: Search online forums specific to Chevy Astro vans. Someone may have already asked the same question and posted pictures or details about its location.
Important Safety Note: Working under a vehicle can be dangerous. Always support the vehicle securely on jack stands before working underneath. Disconnect the negative battery terminal before working on any electrical components.
