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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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?

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

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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.
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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.

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What is a transcoolent line?

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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 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.

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