Question about 2004 Pontiac GTO

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Automatic cooling lines

I need to know the thread size and which is the supply line and which is the return line from the radiator

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The only way i will find or sujest that is by unplugin both lines then atach a rober hose to the end of each line, the have some one old one empty plastic soda can on each line end, and cranck the car for a little be, then suply line will push oil while the return won't, and i will apreciate the ranking to me thanx again

Posted on Jun 17, 2008

  • fernando arevalo Jun 17, 2008

    or also you can bypass the two metal lines with a clear hose and see what way the fluid runs just remeber the suply hose will push while the return will **** the fluid, excuse my english but still learning, since i'm originally from michoacan mexico, close to guadalajara

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1 Answer

How would I convert a radiator from a 1987 Buick regal to my 1991 Cadillac eldorado? And can I 8 run the he oil and tranny cooling lines with one hose each instead two each?


no you must have two lines for each . one is oil and one is transmission fluid, they both have a supply and return line. As for radiator yes use special lines.

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Installed a new radiator - now a small trans fluid leak at bottom of radiator where trans fluid enters radiator.


You didn't get anything cross-threaded, hopefully? I don't know year--make--model--engine size of vehicle?

Usually when I mount a new radiator, I set the radiator in place, then hook up the tranny lines, first, before the radiator mounts, incase I need to move the radiator a little, to get the threads on the tranny lines to match up with fitting threads on the radiator. I usually tighten the tranny lines last.

Take the leaking line loose, check to see if threads look ok? You may have to take radiator mount loose, so you can move the radiator a little to get threads to match up properly. I haven't used thread tape on plastic lines, I guess you could try it, if else fails?

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On a Dodge 727 torqueflight ('68) What cooling line is in and which one is return?


Actually, it does not matter if you are starting over on the lines. All you need to know is that the fluid flows into the radiator, cools down, and goes back into the transmission. In a later model with a cross-flow radiator, I would say the flow is from the trans and into the top fitting on the radiator tank, and the return is on the bottom. As long as they are tight fittings, you're good to go. They are NOT high pressure, so circle clamps and rubber hoses, about 3/8" diameter links the steel lines where they may be new-to-the- old lines. Since it is a 1968, the chances of original lines may be out unless you are restoring whatever model.My fav was the Challenger. On a Hope this helps.

Nov 05, 2014 | Cars & Trucks

1 Answer

I have a leaking hose on 1989 chrysler new yorker 3.0 v6, coming from the transmission one goes to the ac grill the other back around, does anyone know what those hoses are the lower radiator hose connects...


Those are the transmission fluid cooler lines-one is the pressure line, other is the return line-back into the transmission. Often the cooling reservoir is built into the radiator. Apparently yours has a separate cooler in front of the radiator. It would be that and not the a/c grill.
Automatic transmissions generate a lot of heat. Without a way to cool the transmission fluid, the fluid could get burned-it will look blackened, and is very bad for transmissions. Check your transmission fluid and add if necessary. Stop the leak-it may just be a loose fitting, or a broken line or hose.

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1 Answer

The 2000 dodge grand caravan has two lines running from a cylinder just to the right and bottom of the radiator. it looks like power steering fuel runs through


if their metal, the could be coming from transmission fluid lines, are they going into radiator ? one @ top & one @ bottom of rad . their cooling lines from trans, supply / return . if rubber lines, they go to a transmission cooler , looks like a small radiator, rectangular , supply / return. power steering has no cooling . these lines don't come from engine, power steering has power steering fluid NOT TO BE MISTAKEN FOR TRANSMISSION FLUID, TOTALLY DIFFERANT !!!!!!

Mar 24, 2013 | 2000 Dodge Grand Caravan

1 Answer

Why would there be transmisson fluid leaking out of radiator?


Radiators on automatics have a separate reservoir for transm. fluid cooling purposes. Didn't you remove the transm. fluid cooling lines from the radiator-a feed line to the radiator and a return line from radiator to the transmission? They are small steel lines that connect on the end of the radiator.

Dec 17, 2012 | 1993 Chrysler Concorde

1 Answer

What is a transcoolent line?


A Transmission Coolant Line is 2 Lines running from your Transmission to the Radiator 1 line is where transmission fluid goes into the radiator and the #2 line is where it returns to the Transmission, A Automatic transmissions Fluid can Run 400 Degrees or More,The Lines are to Help keep the temperture of the Fluid in your Transmission at a temperture that does'nt exceed the specifications of your transmission operating temperture. Prevent Over Heating and that would result in a Excessive Tep that would cause damage to the Internal Componets and your Front and Rear Seals. NOTE: Some Vehicles Trucks that Tow a Heavy Trailer or something else have a ADD on or some come from the factory with a Truck or SUIV that has a TOW Package on it, if this has this option the Transmission Lines will not go through the Transmission they will go to the Optional Transmission cooler ,thats normally located in front of your Radiator for much better cooling ,it actually works like a Radiator it has Fins and tubes with a Inlet tube and a Outlet tube. This is a Much more effficent cooling Component for your Transmission. Hope i have answered your question. And given you the Help you needed. Thank You.

Feb 22, 2012 | 1998 Dodge Ram 1500 4WD

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My wife's 2000 Saturn (35,000 miles) is dripping red fluid almost directly under the radiator. Dime size droplets, its not a continous leak.


It's automatic transmission fluid, it's leaking out of the radiator or the cooling lines to the radiator.

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1 Answer

Automatic transmission - radiator line leak


The cooling system is pretty much self explanatory hoses go from and to the most obvious places...(you wouldn't try to stretch the lower hose all the way across to the upper hose connection). The trans cooler in the radiator can actually be connected either way. It is non-directional, being a simple coil inside the radiator tank. If you want to install an external trans cooler, that's a bit different...it needs to go on the outflow side of the radiator so it can further cool what the radiator has already cooled down. An easy way to find out which side is the return line, simply take one fitting off the radiator, remove the coil wire so engine dosen't start and "bump" the engine over till trans fluid comes out. if out of radiator nipple you are on the correct side, out of hose, install on other side. Leaking lines can be partially replaced using brass compression fittings made for this. Only use them on straight clean runs, not on heavy rust or bends.

Mar 13, 2009 | 1996 Jeep Grand Cherokee

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