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How to Flush Transmission

Flushing Your TransmissionAs your transmission ages, it may need more advanced services to keep it performing optimally, such as a transmission flush. As the name suggests, a transmission flush uses pressure to flush the existing fluid out of an automatic transmission so that fresh automatic transmission fluid can be added.

When performed correctly, all the old fluid is replaced with new fluid, which includes the fluid in the torque converter and oil cooler lines.

Drivers in Nashville, Gallatin, and Madison can find out how to flush transmissions and improve your vehicle’s performance with this helpful guide from Ron Hibbard Toyota.

Do I Need a Transmission Flush?

Transmission Maintenance

Beyond a standard transmission fluid and filter change, the greatest benefit of a transmission flush is that all the old transmission fluid is replaced with new. This also flushes out build-up, debris, metal shavings, dirt, and anything else that has accumulated in your transmission, torque converter, or oil cooler lines.

Still, it’s important to understand a few things before choosing a transmission flush for your vehicle:

  • A transmission flush is a more intensive process than a fluid and filter change.
  • A transmission flush can’t fix an internal transmission issue.
  • A transmission flush is preventative or restorative maintenance, not a quick fix.
  • A transmission flush isn’t always advised in high-mileage vehicles.

If you’re unsure of whether you should perform a DIY transmission flush on your vehicle, be sure to consult with a qualified technician at our Toyota service center.

How to Flush Transmission

Here are the tools and supplies you need to perform a transmission flush:

  • Nine quarts of automatic transmission fluid
  • Floor jack and jack stands
  • Screwdriver, ratchet, and socket set
  • Wheel chock
  • Drain pan
  • Funnel
  • Old rags or towels

Before beginning your transmission flush, check the dipstick and examine the fluid. If it’s dark, gritty, or has a burned smell, a transmission flush isn’t recommended. In this case, a simple fluid and filter change is needed.

How to flush transmission:

Replacing Transmission Fluid

  1. Start your engine,and allow your vehicle to warm up for a few minutes, then turn it off.
  2. Place the wheel chock behind one of the rear tires and raise the front of the vehicle with a floor jack. Be sure that the jack is securely beneath the vehicle.
  3. Locate the transmission oil cooler lines. These lines run from the transmission to the radiator, in most cases. One line carries hot transmission fluid from the transmission to the radiator, and the other carries cooled fluid back to the transmission.
  4. Disconnect the lower transmission oil cooler line where it enters the radiator. Place the drain pan below to catch the fluid as it leaves the line.
  5. Put your new transmission fluid in easy reach. Pull the transmission dipstick out of the tube and place the funnel inside the tube. Start the engine.
  6. Pour the entire bottle of transmission fluid into the funnel, which allows the old fluid to accumulate in the drain pan. Do your best to keep the funnel from running dry. Once you’ve poured all the transmission fluid into the funnel, turn off the engine.
  7. Reconnect the transmission oil cooler line. Remove the funnel from the tube and insert the dipstick.
  8. Start the engine again and check for fluid leaks. If none appear, turn the engine off and lower the vehicle back to the ground.
  9. Start the engine again and check the fluid level. If it’s full, you’ve completed your transmission flush. If not, simply add enough transmission fluid to fill it back up.

Schedule Your Service Appointment

This article should give you all the tools you need for a transmission flush, but if you’re still wondering how to flush transmissions, the team at Ron Hibbard Toyota can help. Drivers in Nashville, Gallatin, and Madison can schedule a service appointment today!