2013 Hyundai Sonata 2.4L ATF Change questions

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Feb 9, 2017
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Vancouver, Canada
IIRC the hose to disconnect is marked with yellow paint thou, red one is the line with 'hot' ATF coming out from transmission and going into ATF cooler, yellow - the reverse flow from cooler into transmission.
If red one is disconnected then there may be some fluid coming out from the line during fill process, there should be no fluid coming out if only yellow one disconnected.
Red one can be used to evacuate ATF when doing full ATF replacement, just stop engine after collecting about a quart and then add same volume, repeat.
 
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Aug 4, 2020
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Oklahoma
IIRC the hose to disconnect is marked with yellow paint thou, red one is the line with 'hot' ATF coming out from transmission and going into ATF cooler, yellow - the reverse flow from cooler into transmission.
If red one is disconnected then there may be some fluid coming out from the line during fill process, there should be no fluid coming out if only yellow one disconnected.
Red one can be used to evacuate ATF when doing full ATF replacement, just stop engine after collecting about a quart and then add same volume, repeat.
FWIW I had no problem when I did the red line, but you're probably correct. Disconnecting either one is better than not disconnecting either. It still lets it vent.
 

09 GLS

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Okay todays the day! I went to the Kia dealer and picked up the oem synthetic transmission fluid and a $8.47 crush washer for the drain plug 😔 wish me luck guys will post pictures of the magnet and fluid condition.
 
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Not to be taken as an advise, but I didn't change washers on Kias transmissions when doing ATF change, just take washer off the bolt, clean both, flip washer to the other side and put it back on. Didn't have any leaks. I do same thing with oil drain washer, only replacing it every 4th oil change.
 

09 GLS

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Not to be taken as an advise, but I didn't change washers on Kias transmissions when doing ATF change, just take washer off the bolt, clean both, flip washer to the other side and put it back on. Didn't have any leaks. I do same thing with oil drain washer, only replacing it every 4th oil change.
With over 15 years of oil changes I NEVER replaced the crush washer on any oc lol, but in my older age on transmissions I feel like if I’m there “might as well replace it”. Also being as this car has no dip stick I fear a leak or something. For oil I usually just sung the bolt slightly more to re crush it and have never had a leak by doing that.
 
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With over 15 years of oil changes I NEVER replaced the crush washer on any oc lol, but in my older age on transmissions I feel like if I’m there “might as well replace it”. Also being as this car has no dip stick I fear a leak or something. For oil I usually just sung the bolt slightly more to re crush it and have never had a leak by doing that.
return that crush washer, and get dorman 095-149. This is the standard washer that goes on 24mm drain plugs. Google the Kia part cross, its a trans washer. I used this on my miata trans as well. I changed it both times, no sense of risking this on the trans since its such a pain to get to (plastic).


 
Last edited:

09 GLS

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Okay fluid is changed and it shifts amazing!! Direct, fast engagement, smooth even at redline and everywhere in between very happy with the results. Drained just about 4qts and replaced with 4.3 qts to make up what I spilled lol. Fluid was a dark/dirty red almost black and magnet had a ton of shavings, but even with old transmission fluid the transmission still shifted very good - but not as good now 😃 I’ll be doing it in 30k or maybe 3 years.
 

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