Changing Tranny Fluid - Assistance requested - Kia Forum

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post #1 of 13 (permalink) Old 04-29-2019, 06:33 PM Thread Starter
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Changing Tranny Fluid - Assistance requested

Im going to change the Tranny fluid in my 03 Sorento. I understand that the manual reccommends a standard drain and fill, but that will only remove about a third of the fluid.

I've read there is another method which involves removing a hose to the radiator which holds transmission fluid and then engaging the transmission to allow the fluid to pump through the system while filling via the dip tube. Effectively re moving about 80-90% of all the old fluid.

Anyone done this on a BL sorento? What tube is it, any reason not to do this vs several drain and fills?

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post #2 of 13 (permalink) Old 04-29-2019, 07:12 PM
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Drain and fills run less of a risk of running the trans pump dry by accident.
Doing what they recommend is not a bad idea. You can, if you have the money,
do several D + F's a few days apart if you want. I use to do them about every 25,000
miles. When I did them I would let the vehicle set for most of the day and would get
an extra qt from the extended drain time. Everyone's MMV. I also dropped the pan at
120,000 miles and checked the inside of the pan and cleaned the screen and magnets
at that time.
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post #3 of 13 (permalink) Old 04-29-2019, 07:46 PM Thread Starter
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Thanks for the info.

In that case Ill do 3 or 4 few drain and fills over the course of a few weeks and then drop the pan.

Do you have and advice on dropping the pan and cleaning the screen etc?
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post #4 of 13 (permalink) Old 04-29-2019, 08:50 PM
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I'd not recommend full fluid replacement, do D/F at this AT age and probably many miles by now.
Repeat in 5-10K miles if all goes well with the first D/F.
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post #5 of 13 (permalink) Old 04-29-2019, 10:33 PM
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Yep, I agree with the above comments. Do a series of 3-4 drain-and-fills over the span of a few days. Don't overcomplicate it. It's designed to be drained, so do that until the drained fluid is mostly pink. It's a waste of fluid but fluid is cheap.

If the filter is changeable then certainly do that after the last drain. On the newer models, there's no changeable filter but I'm not sure about the '03.
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post #6 of 13 (permalink) Old 04-29-2019, 10:57 PM
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There is a screen in there that can be checked. It is almost a course screen for large particles.
How many miles/KM are one the transmission?
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post #7 of 13 (permalink) Old 05-02-2019, 08:43 PM Thread Starter
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Originally Posted by nstoolman1 View Post
There is a screen in there that can be checked. It is almost a course screen for large particles.
How many miles/KM are one the transmission?
250,000 kms on the transmission. No issues with changing at all, changes smooth as.

Fluid looks about medium-brown on the dip stick, so it has likely been changed at least once before I would say, but probably not for a while.

I think I will just do a single drain and fill initially, drive it for a few weeks and see how to goes, then consider doing another one or two more drain and fills to clean it up a bit further.

I don't think I'll worry about cleaning the screen.
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post #8 of 13 (permalink) Old 05-02-2019, 08:44 PM Thread Starter
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Also just confirming that the 4 speed tranny for the '03 Sorento uses Dex III, correct?
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post #9 of 13 (permalink) Old 05-02-2019, 09:58 PM
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Originally Posted by ZacMonkeys View Post
Also just confirming that the 4 speed tranny for the '03 Sorento uses Dex III, correct?
Yes. Unless they have come out with a replacement Dex product. I use to pick it (1 gal jug) up at WalMart under their Tech 2000 brand oils. If you let it drain a long time I think you get 4-5 qts out.
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post #10 of 13 (permalink) Old 05-05-2019, 04:08 AM Thread Starter
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So I did a change and fill, replaced 4 liters with Dex III. All went well. Fluid didn't look too bad, was a bit brown but not as bad as it could have been. Seems to be driving well and changing smoothly.

I think I'll replace another 4 liters in a week or two.

The drain plug bolt was a standard bolt, non-magnetic. I'd like to replace it with a magnetic bolt when I do the next change. I know it's a 14mm head but I'm not sure of the thread size.

Anyone got a link to a magnetic bolt that will fit?
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