Which is better?

- A
- August
  
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posted
20 years ago

Thu, Nov 27, 2003 5:43 AM

Got to do an ATF drain and refill along with filter replacement on a car that has some really really dirty transmission fluid so I figure what I'll do is one of the following:

A) Pull the pan first and replace the filter and then refill with new ATF and then a week or two later, just drain again and refill and maybe do it a third time.

(This particular car has an allen bolt on the transmission oil pan.)

B) Drain and refill. Drain and refill. Pull the pan and replace filter and then refill for a third time.

I'm leaning towards choice B.

- B
- Bill Kapaun
  
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posted
20 years ago

Thu, Nov 27, 2003 7:50 AM

You might drain, start the engine for a FEW seconds and try to pump a bit more out and then refill.

- D
- Daniel M. Dreifus
  
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posted
20 years ago

Thu, Nov 27, 2003 3:55 PM

Found this on the Web - haven't tried it, but sounds reasonable.

drop pan, change filter, reinstall. Measuring the old fluid in pan into a milk bottle type container. Install that amount of new ATF back into transmission. Disconnect BOTH ATF cooler lines at radiator and place a container or pan under each line end (helps to have an assistant). Start engine, shut down after 1 or 2 quarts have come out one of the lines. Refill exact amount of fresh fluid in transmission ( keeps air out of system).

Start engine again and repeat until clean fluid is coming out of cooler line. This is messy and time consuming but will purge all old ATF from transmission and torque converter. Reinstall cooler lines and start car, cycle through gears, place in park and check level per owners manual. Check for leaks. Top up as necessary after driving and heated up. Don't overfill.

You just safely flushed the whole system