Transmission Fluid Cooler Backflushing and Cleaning

2009 Mercury Milan AWD L4-2.3LSECTION Transmission Fluid Cooler Backflushing and Cleaning



Transmission Fluid Cooler - Backflushing and Cleaning









NOTE: Transmission fluid cooler backflushing and cleaning will be performed using the Turbo-Tank Heated Cooler Line Flusher or equivalent. Follow the manufacturer's instructions included with the machine. Test the equipment to make sure that a vigorous fluid flow is present before proceeding.

NOTE: If the vehicle is equipped with an in-line transmission fluid thermal by-pass valve, the in-line transmission fluid thermal by-pass valve must be removed prior to flushing out the transmission fluid cooler and transmission fluid cooler lines.

1. Check and top off fluid level of the Turbo-Tank Heated Cooler Line Flusher or equivalent tank with transmission fluid.

2. Allow the fluid in the Turbo-Tank Heated Cooler Line Flusher or equivalent 15-30 minutes to heat up to 60°C (140°F) before using.

3. Install the line adapters into the transmission cooler lines.

4. Attach the Turbo-Tank Heated Cooler Line Flusher or equivalent red line to the transmission fluid cooler pressure line quick disconnect fitting.

5. Attach the Turbo-Tank Heated Cooler Line Flusher or equivalent blue line to the transmission fluid cooler return line quick disconnect fitting.

6. Follow the equipment instructions to purge the cooler lines and cooler prior to starting the flushing procedure.

7. Allow the cooling system to backflush for 10-15 minutes, then flush the cooler in a normal flow direction for an additional 10-15 minutes.

8. If equipped, clean the in-line transmission fluid thermal by-pass valve by hand.

RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.