1. Identify the Transmission Type: This is crucial. A 1989 B250 could have several different automatic transmissions. You need to know the *exact* type to use the correct fluid. Check your owner's manual (if you have it) or the vehicle's identification plate for the transmission code. This will often be a letter and number combination (e.g., 727, 904).
2. Locate the Transmission Dipstick: The dipstick is usually located near the transmission itself. It's often a long, thin rod with a handle. It might have markings for "ADD," "FULL," and "LOW." Look around the engine bay, near the transmission. Many times it's close to the back of the engine and somewhat hidden.
3. Check the Fluid Level (When Engine is Running): Before adding any fluid, you *must* check the fluid level. Crucially, this is typically done with the engine running and warmed up (but not overheating). Follow this procedure:
* Warm up the van: Run the engine until the transmission fluid reaches operating temperature. This might take 10-15 minutes of driving.
* Park on a level surface: Ensure the van is parked on a level surface to get an accurate reading.
* Engage Parking Brake: Securely engage the parking brake.
* Remove the dipstick: Carefully remove the dipstick, wipe it clean with a clean rag, and reinsert it fully.
* Remove and check the dipstick: Remove the dipstick again and check the fluid level against the markings.
4. Add Transmission Fluid (If Needed): If the fluid level is low, add the *correct* type of transmission fluid specified for your transmission. Use a funnel to avoid spills. Add the fluid slowly, checking the level frequently to avoid overfilling. Never overfill. Overfilling can damage the transmission.
5. Re-check the Fluid Level: After adding fluid, wait a few minutes, then re-check the level with the engine running again, following the same steps above. Ensure the level is within the "FULL" mark.
6. Dispose of Used Fluid Properly: Used transmission fluid is hazardous waste and needs to be disposed of responsibly. Check with your local municipality for regulations and disposal options.
Important Considerations:
* Fluid Type: Using the wrong transmission fluid can severely damage your transmission. It's absolutely critical to use the correct type specified in your owner's manual or from a reputable parts store (providing your transmission type).
* Leaks: If you find your transmission consistently low on fluid, you likely have a leak. This needs to be addressed immediately to prevent serious transmission damage.
* Slipping or Rough Shifting: Low transmission fluid is one possible cause of these issues, but there could be other underlying problems. If your transmission isn't shifting smoothly, you should take it to a mechanic for diagnosis and repair.
In short, adding transmission fluid is a relatively simple process, but it's essential to follow these steps carefully. If you're unsure about any part of the process, please consult a qualified mechanic. They have the tools and expertise to diagnose and address any transmission problems correctly.
