Auto Repair

How To Do A Transmission Flush

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Transmission fluid is a crucial component to keeping your vehicle operating at its very best. For this reason, it is recommended to have your transmission fluid both flushed and replaced regularly.

Typically, this service will be done every 30,000-60,000 miles. However, factors like make, model, climate, and driving style can alter the timeline. Keep an eye out for any of the following signs that indicate low transmission fluids. Use our guide below to do a proper transmission flush.

Necessary Supplies For A Transmission Flush

Before starting this task, make sure you have the following supplies on hand:

  • New transmission fluid.
  • Oil drain pan.
  • Jack and jack stands.
  • Wrenches and sockets.
  • Funnel.
  • Filter kit.

As with any DIY car repair, you will need to work safely. Ensure your vehicle is parked on a level surface, while applying the parking brake. Wearing safety gear like gloves and eye protection is strongly recommended.

Step 1. Find Transmission Cooler Inlet Hose

  • Begin by referencing your owner’s manual to find the transmission cooler hose.
  • Place your oil drain ban beneath it.
  • Make sure to have your fluid containers opened and nearby.

Step 2. Drain Old Fluid And Flush The System

  • Disconnect the transmission cooler line that enters your radiator with hot fluid.
  • Using a thin funnel in the dipstick tube, start the engine and pour the clean fluid into the funnel.
  • As the fluid enters, the old fluid will be pumped out of the cooler line into the drain pan.
  • All contaminants will be flushed out of the system.
  • Use 8-10 quarts to finish the flushing process.
  • Turn your engine off at this time.

Step 3. Remove The Pan

  • If your vehicle has a removable transmission pan, now is the time to remove it.
  • Once this is removed, you can access the transmission filter.
  • Replace your filter, if necessary.

Step 4. Clean The Pan

  • Remove any debris or residue by cleaning the pan thoroughly.
  • It may not properly seal if it is not completely clean.

Step 5. Install New Filter

  • Install the new transmission filter using the instructions provided in the filter kit.

Step 6. Replace The Pan

  • Securely reattach your transmission pan.
  • Seal this with the required gasket or by using a silicone rubber adhesive sealant.
  • Torque the bolts according to the manufacturer’s recommendations.

Step 7. Refill With New Transmission Fluid

  • Use your funnel to add the appropriate amount of new transmission fluid.
  • Reference your car’s manual for the correct type of fluid and amount.

Step 8. Start Up The Engine

  • With your foot securely on the brake, start your engine and move the shifter through every gear.
  • Allow the engine to run for several minutes in order to circulate the fluid.

Step 9. Check Fluid Level

  • While running the engine, check your transmission fluid level.
  • Top it up, if needed.

Step 10. Test Drive

  • Take your car for a short test drive at this time.
  • Make sure your shifting is smooth.

How Long Does It Take To Flush A Transmission?

As mentioned, most professionals can perform this task in less than 4 hours, on average. A transmission fluid change, meanwhile, can be completed in just 30 minutes. The fluid change involves removing the transmission pan and cleaning out any older fluid that built up in the transmission over time.

Transmission Flush Benefits

Transmission flushes can be beneficial for many issues within a vehicle. These flushes ultimately remove debris or sludge that can damage the car’s transmission.

Here are a few transmission flush benefits:

  • Extend vehicle life.
  • Improved shifting.
  • Less heat produced by transmission.
  • Improved vehicle performance.

How Often Do You Need A Transmission Flush?

As mentioned above, the auto care professionals strongly recommend that you change your transmission fluid every 30,000 miles or every 2 years. Reference your owner’s manual for recommendations about transmission flush frequencies.

Heath’s Auto Service In Scottsdale, AZ

At Heath’s Auto Service, we offer a comprehensive range of services and repairs to meet all your automotive needs. From routine maintenance like oil changes and tire rotations to more complex repairs involving brake systems, engine diagnostics, and transmission issues, our highly skilled technicians are equipped with the latest tools and technology to ensure your vehicle is serviced to the highest standards. Contact our team today!

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