You don`t say kind or model of car so this will be generic. with the car on a level surface running and warm, find the transmission dipstick tube, remove the dipstick wipe it off re-insert and pull out check the level at the end of the stick with it facing down so oil won`t run up the dipstick giving the wrong level. there should be markings on the end of the dipstick that will indicate from low oil to proper oil level. also smell the oil if it smells burnt have the transmission service done(change oil and filter). it should be a reddish colour not brown or dark in colour.
SOURCE: how to add or check transmission oil
this t-bird has a 5r55s trans. it does not have a dipstick.
it has a "standpipe" type leveling system.
to check fluid level the tranmission has to be within 80-120 degree f.
take the plug out of the center of the fitting located on the bottom of the trans pan. it is a torx 30.
running in park the fluid should drip slower than a coffee pot.
to add you need a npt thread fitting the same as the little plug you removed. and attach a bottle of mercon5 and hose to it. squeeze the bottle to add fluid
then recheck it by letting it drain out to a fast dribble. then install the little plug back in.
remember 80-120 degree fluid temp.
SOURCE: checking transmission fluid level on 2005 c230 kompressor mb
what fluid did you want to check? oil, coolant, transmission, brake? let me know and maybe i can help. the leak you currently see what color is the fluid? black or dark brown probably enigne oil. red or dark brown probably some kind of hydraulic fluid--trans or brake, yellow, green or blue with a sickly sweet smell is probably coolant. i haven't worked on a c230 but as far as i know all transmissions have a dipstick where you can check the level. check your owner's manual. make sure the car is warmed up such as after a short drive to properly circulate and check the trans fluid. some cars also require the transmission to be placed in a specific position ie neutral when being checked. again check your owners manual.
to the guy that was critical about your question, i hope he stays as dumb and ignorant about his/her car as he seems as with his/her attitude--just keep bringing it to servcie, that way i can keep making a lot of money out of you. i actually prefer an owner who knows a litlte some thing about their car and how it works--it makes the job easier in communicating to me what may be wrong and thus i can save them time and money. we both win. just don't tell me what you think it is--just tell me the symptoms are, as a professional it's my job to figure it out from there. hope this helps.
SOURCE: transmission fluid level
I have a 1998 Isuzu Rodeo however when I purchased the vehicle I managed to obtain a service manual on mine.
Mine is a V-6 3.2liter engine with automatic transmission and it took me a while to find out where I added transmission fluid at too.
It is located under the vehicle on the Passenger side of the vehicle and it is located on the transmission just before the transfer case. There is like a eye beam across one side to another then there is like a Indent the lower one is for drain and the upper one with a larger bolt like plug is the fill hole. I used a turkey baster with a large bulb like affair to **** the transmission fluid in to it from the bottle then I inserted the baster up and into the hole vacated by the plug. Then squeezed the fluid into the transmission and kept at it till the fluid dripped out on its own. I hurried and inserted the plug into the hole and screwed into it and tightened it up and lowered the vehicle down checked after the vehicle had been warmed up and re jacked the vehicle up and rechecked and all I needed was a small squirt into it and it was full and since then it has been running really well since.
Lucky W Donegan [email protected]
Polson, MT.
SOURCE: Transmission fluid type and level
This is complicated.... Ok, your right, no dip stick is there! This is how it works.
Underneath the car, there is a plug (11mm) on the transmission case on the passenger side. It is about 3" up from the pan edge and on the front side of the case. With the engine running in PARK, remove this plug. If trans fuild doesn't run out of the hole, the level is low. Pour it in the hole on top (where the red cap is) until the fluid runs out - all while the car is running. Once it is roughly dribbling out, the trans is considered full. replace plug. Your done!!
Easy ehh? Dexron III fluid
SOURCE: need to check transmission fluid in a 2001 auto jetta
I BELIEVE IT IS A SEALED TRANSMISSION WITH NO WAY OF CHECKING FLUID... aT LEAST IN MY 01 tdi
After the vehicle was driven for a while to let the
transmission fluid warm up, place your vehicle on a level ground. Set
the parking brake. Make sure the transmission is in "P" (Park) position.
Leave the engine running. Find the automatic transmission dipstick
(your owner's manual will tell you where it is located). Pull the
dipstick out.
Wipe the dipstick off with a clean lint-free rag. Insert it
back fully. Pull it out again and check the fluid level. A
transmission fluid expands when warmed up, so if the car has been driven
for a while (20-30 minutes), the transmission level should be between
"HOT" marks. If the vehicle is cold, the level should be between "COOL"
marks.
Check the fluid condition: a very dirty fluid with strong
burnt smell is a warning sign of transmission problems. Normally the
automatic transmission fluid should be clean and transparent, as in
these photos. 
On most cars the new transmission fluid comes red (photo on
the left). Over the time it becomes brownish, as in the photo below. 
This is how the synthetic transmission fluid looks after
two years of driving - it's still clean and transparent. If
your fluid looks very dark or dirty, check your owner's manual, maybe
it's time to change it. Some manufacturers require to change the
transmission fluid at 30,000 or 50,000 miles others specify that you
never have to change it - check what's your car owner's manual says. 
If the transmission fluid level is low, you can top it up,
but be careful not to overfill it. Overfilling the transmission can
cause problems.
It's very important to use only specified transmission fluid
type - check your
owners manual or simply visit your local dealer, they always
have proper transmission fluid in stock. Incorrect fluid type can
damage your transmission. How to top up the transmission fluid: Using a
thin funnel, add a small amount of the fluid through the dipstick pipe.
Wait for a few minutes - let the fluid drain down. Recheck the level
again. Don't overfill
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