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Old 11-14-2002, 03:11 PM
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Join Date: Oct 2001
Posts: 226
Flushing out atf

What is the procedure to "flush" out the automatic transmission fluid when you change the atf?

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Old 11-14-2002, 03:30 PM
I told you so!
Join Date: Jun 2002
Location: Motor City, MI
Posts: 2,852
For my other cars, this is the typical procedure I use:

1. If needed, replace trans filter. Put pan back on.

2. Disconnect the atf return line from radiator.

3. Connect the return line to a waste container, preferably with clear tubing.

4. Start car and idle to pump out old fluid...stop when fluid stops coming out. You'll probably get a few quarts out.

5. Fill trans with new fluid through fill hole with equal amount of fluid that was just pumped out.

6. Iterate between Steps 4 & 5 until clean fluid comes out of return line.

7. Button everything back up and trim fluid to proper level.

I've done this for a number of cars. Be forewarned that this usually leaves a big mess under the hood and on the floor.

I don't know if this would be a good procedure to use on some Mercedes models, since a regular drain and refill (including torque converter) would probably get 80-90% of the fluid with much less mess.

95 E320 Cabriolet, 159K
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