I have a leak in the lines running along the bottom of the radiator what are those lines?

The only thing they could have done is maybe crack a transmission cooler line. It runs along the bottom of the radiator. Check for leaks there. Check the transmission fluid level also.

Get the coolant pressure tested, its definitely leaking coolant. You will need to get the coolant running line.

Pressure test will help you to know from where exactly coolant/refrigerant is getting leaked.

===========

For complete step by step troubleshooting i suggest you to go through the help link mentioned below :----
Click the link below: -----

COOLANT LEAK ISSUES, COOLANT LEAK PROBLEMS, COOLANT SENSOR, LOW COOLANT,
http://alltypesofpartsreplacing.blogspot.com/2012/12/coolant-leak-issues-coolant-leak.html

=========
These will help.
Thanks.

Coolant leaks can sometimes be difficult to locate the exact origin of the leak. That is why proffessional technicians use pressure testers, bright flashlights, inspection mirrors, and in some cases even borescopes to locate the cause.

With that said, I would say that if you have a "radiator leak" and it is "on the bottom of [your] radiator" my first guess is that it is coming from the radiator itself....check the area of the radiator where the plastic tanks are crimped to the cooling tubes (main radiator core). Sometimes the fittings in the tanks leak where the transmission cooler lines connect.

I have also seen leaking radiator caps misdiagnosed for a leaking radiator....Sometimes they will leak and the antifreeze will run along the sides of the radiator and "mimick" a radiator tank leak. Remember, the coolant almost always travels DOWN and REARWARD. Sometimes it goes way to the left or the right, but it still goes down and back from there.

A bright flashlight and an inspection mirror will verify most leaks. You may also want to detach the fan shroud and move it back for better inspection of the radiator. - start where you can see the coolant and follow the trail upward....

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.

A500 & A518 Overdrive Automatics (and the 904, 727 and other variants) run the Transmission Cooler Lines out of the Left side of the Transmission, near the Shifter Linkage & Kickdown linkage.
The lines then run along the side of the transmission, along the side of the engine oil pan, to the bottom tank of the radiator (or external cooler, if the truck had an external cooler installed).

Crossing the lines would not cause a leak. i think you need to take a good look at the lines and see if its the connection to the radiator or a rusted line or bad hose, some of theses came with the trany lines being all rubber hose from ****** to radiator and some were rubber and then change to metal tubing , anyway it doesnt matter which you have but i will bet its leaking from the lines , it may be the line itself or the connection at the radiator, clean the area with some engine cleaner and rinse off then run the engine and watch where the leak comes from, maybe the line just needs tightening. good day.

these lines could be coming from a transmission cooler, raise the hood on your vehicle, and look down in the front through the grille area, if it doe's have a transmission cooler, you will be able to see it, and then follow the lines that run from it to where you just described along the bottom of thre radiator.

The two trans cooler lines run from the trans to the radiator,they are routed along the engine block.
If you can find which one is leaking you can cut the line and install a piece of 5/16 rubber gas hose and two clams to repair it.

Good chance it's the transmission fluid. The passenger side of the radiator is the transmission cooler side and the coolant is leaking from the transmission lines. There should be two lines, one on top which is the inlet and the bottom one which is the return line. Check to make sure there is no corrosion along the lines or that the line has not come loose at the radiator. Locate the leak and repair or replace the lines. Good luck and take care not to run low on transmission fluid, low fluid in the system will cause the transmission to burn out.

Before you remove the radiator, check the transmission line connection's at the passenger side. There should be two, one at the top ( in ) and the bottom ( out ). There are only in place by a quick release and see if which line is leaking and replace the line or the O ring that seals the line to the radiator. Good luck and hope this helps. The transmission cooler only runs down the ends of the radiator. Good luck and hope this helps. Keep me posted, be glad to help.