Hi,
There really isn't any fluid in the CV joints. They are packed with grease and then the CV boot seals the grease in and dirt out.
I'm on the opposite side of the country, so timing may be off for us. LOL
As far as replacement, the least expensive way to fix one (if bad) is to replace what is called the half shaft. Basically, you get a new axle with two new joints ready for installation. However, since you barely hear it, you should be okay for a while. If it is the joint, it isn't something that will just break. The clicking will get louder as it progressively gets worse. Eventually, it could break, but again, not overnight.
Let me know if you notice any grease that may have been flung under the inner fenders, on the backs of the front tires, or at any other location.
Also, if you are the original owner of the vehicle, a CV joint is still under warranty. It came with a 10-year 100,000-mile warranty. See pic below. The pic is from a 2013. Kia owner's manual.
Let me know what I can do to help.
Joe
See pic below.
Image (Click to make bigger)
Saturday, March 12th, 2022 AT 12:18 PM