Is there a transmission fluid dipstick on 2007 cobalts

Tranny fluid. Your owners manual says you should never need to check it, unless you have a leak. I agree with Gene.

if its the the gear selector is moving and not going into gear ----under hood drivers side under brake mastercylinder is the top of transmission the gear selector cable connection is there check that it hasnt come off,loose or damaged ----=if selector does go into a gear and trans not responding look under drivers side and thru wheel wells for fluid leak ---theirs no dipstick so to check fluid
There is a black cap located on top of the trans almost directly under the brake master cylinder. It's about 2 inches high, 3 inches around. That's where you add the fluid. The checking procedure is as follows: Start the engine and allow the engine to idle until the transmission fluid temperature has reached the value specified. 104 degrees F.
Depress the brake pedal and move the shift lever through the gear ranges, pausing a few seconds in each range. Return the shift lever to the PARK range.
vehicle must be level with the engine running and the shift lever in the PARK range.
Remove the transmission oil level control plug.
The plug in an 11mm bolt located between the r/s axle seal and the oil pan.
Check the fluid level. The fluid level should be even with the bottom of the threaded plug hole.
If you remove the plug and nothing comes out, add about half a quart at a time until the fluid starts to dribble out. Once it stops, the level is good.this is the procedure to check fluid if their is fluid and problem still persists the transmission module and or internal transmission damage possible which a mechanic {transmission}would need to diagnostic check the following link has multi videos for the cobalt transmission 05 Cobalt Transmission Fill Yahoo Video Search Results

It doesn't have one. To check the fluid you have to pull a plug from the passenger side of the transmission, by the CV shaft. Start the car and pull the plug. If fluid comes out, it is full. If not then add. The fill is the red cap on the top of the transmission.

according to wiki.answers.com
"Chevy Cobalt has a sealed Automatic Transmission... no dip stick. Probably best to take it in to get service by trans shop if you think it needs changing or re-filling."
Or
"There actually isn't one. It's a sealed system. There is a cap to fill the transmission directly ontop of the transmission. If you need to check the level, lift the car in the air and there is a 11mm plug on the bottom of the transmission, With the car running (WARNING: THE CAR MUST REMAIN RUNNING WHILE PLUG IS OUT!!!!) take the plug out, the fluid should trickle out of the hole. If no fluid comes out add fluid. AGAIN DONT SHUT THE CAR OFF WHILE IT IS RUNNING OR ELSE FLUID WILL POUR OUT!"

Hello the transmission has no trans dipstick. it is a seal for life trans. the engine dipstick is located
is the front of engine towards the driver side. it will have a yellow handle

http://www.fixya.com/cars/r6735274-check_transmission_fluid

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

There's a red handled dip stick located on the rear of passenger's side of the engine, this is the place you put in the fluid and check the level. A small long necked funnel helps, be carful not to overfill it as doing so may cause a major leak from over pressurization.

checking the transmission fluid involves lifting the vehicle and removing a plug on the transmission, it is quite difficult and messy if you don't have access to a lift, the vehicle has to be level and at operating temperature in park, there is a small plug on the side of the transmission near the passenger axle shaft. remove the plug slowly, i believe it is an 11mm bolt, if fluid drips out, the level is ok, if no fluid comes out, there is a small plastic screw on cap on top of the transmission itself on the driverside near the oil filter cap, add fluid slowly untill fluid starts to drip out of the plug hole, once the fluid starts to drip, insert the plug and tighten, don't overtighten, just snug it up.!!!make sure you use the right fluid, this is important!!! i believe your fluid is dextron 6, double check in your owners manual, the use of any other fluid will cause damage!!! also, do not remove the small plug on the front of the transmission, that is the pressure plug, all the fluid will shoot out with force if that plug is removed!!!

you take it to a repair shop and they unhook your transmission cooler lines and pump old fluid out and install new fluid in.

make sure you read the tranny dipstick first. also make sure engine is at operating temp.you pour tranny fluid in the dipstick hole with a funnel