How do I check Transmission Fluid on my 2007 Jeep Liberty

It seems to be a well known issue

https://www.google.com/search?q=2005+Jeep+Liberty+Whining+Noise+From+Transmission

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It doesn't have a dipstick because checking trans fluid isn't as simple as just pulling the stick and reading it.
Trans fluid level varies greatly with temperature and tolerances in today's transmissions are very close. If fluid is overfilled by a small amount it can raise up into the geartrain as the trans warms, the fluid churns and ingests air and the transmission fails. Simply overfilling the trans can lead to complete trans failure.
To get an accurate fluid level you have to use a scan tool to check the actual temperature of the trans fluid. Once the temperature is taken then a chart is used to see how many millimeters of fluid should show on the stick, and then a special dipstick is used. The stick has a stop that seats in a certain way depending on vehicle, and it's labeled in millimeters.
If you don't have a trans leak and no repairs have been done then your fluid is full and checking it is never necessary. If you do have to have the fluid checked then a shop with the proper equipment can check it for you in a couple minutes.

This info was copied from another site: 2007 Jeep Liberty you check atf when it did not come with dipstick

Alot of the newer vehicles have maintenance free transmisions so they dont have dip sticks. And if it is maintenance free it will tell you under the hood.

it is most likely the belt , you should replace it

No,You need a rebuilt or new transmission,I see this in alot of Jeeps,Even if you maintained the transmission fluid and drove carefully,the transmission itself is a problems.

The transmission fluid stick is usually toward the back of the engine.That's right where the engine transmission connect together.It should also be labeled transmission on top of the stick.To check transmission fluid level,you need to let it run about 5 minutes on a level surface,then check the level.When you check it,if you see little metal flakes on the stick,there is something very wrong with your transmission.Good luck! Greg

Service Fill 4.73Liters (10.0 Pt Mopar ATF +4 Automatic Transmission Fluid is the recommended fluid for Daimler Chrysler transmission
hope this helps you,let me know have a good day Darrell

You always check transmission fluid with it running and in park,If your dip stick has a place on it for cold use it cold,Other wise it should be on the full mark,you might want to look under your jeep for any new leaks!

according to my parts manuals for your jeep the trans filter is inside the transmission, u will need to pull the pan off to change it. Here is a picture.

Check Again It May Be Like A Dark Red Brown Color Best Advice Is To Look Toward The Transmission From Engine View.