Transmission overheating - Cars & Trucks

Probably a damaged coupling or badly worn pipe.
If not too late, replace the lines and refill the transmission with Mercedes Transmission Oil.

Question edited for typos.
Question moved to year / model category.

First start with the overheating. hopefully the water pump isn't failing. This explains how to get airlocks out and get good circulation. When was the radiator flushed?

https://www.fixya.com/cars/r29872074-vehicle_cooling_system_no_heat

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Nino, coolant does not belong in a transmission, only recommended lubricants for that model of vehicle.
If you are asking if transmission overheats, does it effect shifting, yes overheated transmission can effect shifting.
PRESS THE HELPFUL BUTTON and check links below

Transmission Overheating Your Worst Enemy Transmission Repair Guy

Meet Your Automatic Transmission Number One Enemy Overheating


https://www.google.ca/url?sa=t&rct=j&q=&esrc=s&source=web&cd=10&cad=rja&uact=8&ved=0ahUKEwjbgfeGoufKAhWBKhoKHcr6C18QFghVMAk&url=http%3A%2F%2Fwww.transmissionrepaircostguide.com%2F10-common-transmission-problems%2F&usg=AFQjCNFvdJgcDHyL9hF8wslh8YSd_OhJXQ

Common Transmission Problems Symptoms Causes Repair and Cost Information

What's overheating? the engine or the transmission? If the transmission is getting hot, then most likely the cooler lines weren't cleaned. If it is the engine. It's just coincidence. Start with the thermostat.

How do you know that your transmission is overheating? Do you have a heat gauge for it? Does it stop working? Won't pull under load? You need to give more information than "transmission overheating"

Overheating is caused by few possibilities .All needs to be checked inspected.I recommend you few help links to troubleshoot the issue.Click the link below:---

Car engine Overheats and transmission starts slipping?

http://schematicsdiagram.blogspot.com/2011/12/car-engine-overheats-and-transmission.html
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Car overheats and Air blows hot at idle?

http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html

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Engine overheated then car will not start?

http://schematicsdiagram.blogspot.in/2012/02/engine-overheated-then-car-will-not.html-----

All types of car overheating problems and troubleshooting?

http://technoanswers.blogspot.com/2011/11/all-types-of-car-overheating-problems.html
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Car freeze overnight and started overheating while driving? http://technoanswers.blogspot.com/2012/01/car-freeze-overnight-and-started.html


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Vehicle Is Overheating http://technoanswers.blogspot.in/2012/07/vehicle-is-overheating.html

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These will help.
Thanks.

This is caused by an overheated transmission, the overheating is caused by an internal failure of a severe overloading of the transmission like towing.

For car running hot and overheating issues, I suggest to you go through this help links. Click this link below and go through the troubleshooting procedure to take care of the problems: ----

Coolant enters in transmission? http://schematicsdiagram.blogspot.com/2012/01/coolant-enters-in-transmission-on.html

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Squealing at start up on car? http://technoanswers.blogspot.com/2012/01/squealing-at-start-up-on-car.html

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Car runs hot? http://howtobyme.blogspot.com/2011/11/car-runs-hot-in-traffic.html
-----------All types of car overheating problems and troubleshooting?

http://technoanswers.blogspot.com/2011/11/all-types-of-car-overheating-problems.html
Car freeze overnight and started overheating while driving?http://technoanswers.blogspot.com/2012/01/car-freeze-overnight-and-started.html-----------Engine Overheats and heater blowing cold?

http://howtobyme.blogspot.com/2011/11/engine-overheats-and-heater-blowing.html

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Car overheats and Air blows hot at idle?
http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html
--------overheating? http://schematicsdiagram.blogspot.com/2011/12/buick-century-overheating.html
----------Car engine Overheats and transmission starts slipping?http://schematicsdiagram.blogspot.com/2011/12/car-engine-overheats-and-transmission.html
----------This details will help.Thanks.

Your transmission fluid is dangerously low (tranny is dry). The pops & jerks are the transmission
internal components trying not to seize onto each other due to lack of lubrication and/or overheating.
Low transmission fluid leads not only to loss of lubrication but lots of overheating (of the tranny).
The loss of Elantra performance (speed tops out at 55), is caused by power loss due to friction inside the transmission. All your power is lost overheating the transmission (toward destruction), instead of
being transmitted through the transmission to the wheels.

The 2004 Elantra takes Hyundai SP-III Automatic Transmission Fluid, with 8.4 quarts used in a
total refill - but just 5 quarts at a fluid change. For How-to transmission fluid change instructions:

http://en.allexperts.com/q/Hyundai-Repair-815/2004-Elantra-GT-transmission.htm

www.autozone.com claims that 2004 Hyundai Elantra can take these non-Hyundai ATF's:
Lucas Semi-Synthetic Multivehicle ATF
Pennzoil Muilt Vehicle ATF
Valvoline Maxlife Dex/Merc ATF
Castrol High Mileage ATF

I would begin by checking the transmission fluid level. If it's ok, then that means that your transmission has overheated. Have it checked for overheating damage by a professional transmission shop. If everything checks out ok have them add a secondary transmission cooler. This will allow the transmission to cool down faster under heavy hauling conditions. Hope this helps, good luck!