Transmission line leaking near fitting on transmission

Here are the steps to install the transmission cooling line with a rubber seal on a 2001 Pontiac Grand Am GT:

1. Raise the vehicle: Use a jack and jack stands to lift the front of the car off the ground.
2. Locate the transmission cooler lines: The transmission cooler lines are located on the passenger side of the vehicle near the front of the transmission.
3. Remove the old transmission cooling line: Use a wrench to loosen the fitting where the old transmission cooling line connects to the transmission. Slide the fitting away from the transmission and let the old line drain.
4. Install the new transmission cooling line: Insert the new transmission cooling line into the fitting on the transmission. Make sure the rubber seal is securely seated.
5. Tighten the fitting: Use a wrench to tighten the fitting on the transmission. Be careful not to overtighten, as this could damage the fitting or the new line.
6. Lower the vehicle: Use the jack to lower the vehicle back down to the ground.
7. Check for leaks: Start the engine and let it run for a few minutes. Check for leaks around the fitting on the transmission and around the rubber seal on the new line.

If you need additional assistance or want to see a video tutorial, I would recommend searching for videos on YouTube that specifically cover the installation of transmission cooling lines on a 2001 Pontiac Grand Am GT.

so repair leak and most likely your proportioning valve - or distribution block remove fitting

Do you know if the leaks are coming from the actual lines or the fittings to where these transmission lines connect to ? If it's the fittings, you may need to replace the radiator all together since most are made of plastic and fittings are molded to them.

You are leaking transmission fluid from either the fluid cooling lines that run from transmission to a separate reservoir in the radiator, or leaking from the reservoir itself. Hopefully, it's only the lines and may just need tightening to stop the leak.
There are two lines to the radiator's reservoir. One brings fluid from transmission to the reservoir, and a return line back into the transmission. Probably located on driver's side of the radiator, one will be near top of radiator, and one near the bottom. Small copper or steel lines that may also turn into rubber lines. Clean the area well with rags to locate the leak. Will probably need to have the car running to make it leak, while looking for it. You could also take a wrench and try tightening the fittings at the radiator, and tighten any rubber hose clamps that you see. If it's not the lines or hoses that are leaking, then the radiator may need to be pulled off for repairs or replacement. But 9 times out of ten, it is a leak from one of the lines.
When fixed, don't forget to check your transmission fluid level. Or keep adding till it is fixed.

Yes it sounds like the tranny. Possible an easy fix though. There are two line that go from the tranny to the radiator or possibly a trans cooler. The connections may be lose. There is a cheap way to fix this and that is buying the brass barbed hose fittings that will screw into were the existing line go into the tranny and get transmission cooler hose and run new lines. Or replace it with original parts. I would like to say you are probably be fine to drive it as is just make sure to keep fluid level full. But if they come completely out or break lose you will be stuck and will lose all 7 to ten quarts of tranny fluid. Also when you check you tranny fluid it has to at operating temp and the engine running. Good luck hope this helps.

I would say transmission cooling lines cracked or loose near or at the radiator, If so get the lines from any auto parts they should be 1/4, 5/16, or 3/8 screw the right one into the radiator tank and cut the lines to fit and use a compression union to put them together

Cut the line where its leaking and splice it with a 5/16 compression fitting.

fix the coolin lines going to the tansmission cooler its probably loose fitting going into the radiatior cooler 16mm wrench should fix u up 5/8"is the same as 16mm.

if it is just the steel line you can cut it and reflare the end

Could be a leaking transmission line, or leaking at the fitting at the radiator.