Can't figure out coolant leak HELP PLS

Skinruggers · 2025-10-05T09:23:47-0400

So my 2.7 2006 GV auto has a weird coolant leak. One/both of the bottom coolant hoses leak (the two similar size hoses that attach to the bottom of the radiator attachments that look like bolts - visible if you take off the plastic front skidplate; can take a pic later). When I tighten them, everything is fine... until I even touch the heat/AC, then the heavens open up and the hoses start leaking at those attachments.

NOTE: it is NOT the hoses themselves. They are in good condition. It is the bolt-looking connection point to the rad that leaks. Any ideas what it is? Solutions?

Edit: picture: (where the green drop is)

fordem · 2025-10-05T09:57:26-0400

I think you need to go take a closer look, your radiator has two coolant hoses, one bottom, one top, they're about 50mm or so in diameter, the other two hoses at the bottom, the little ones, which I think are what you're describing, connect to the automatic transmission "heat exchanger" in the radiator bottom tank, and those should have automatic transmission fluid flowing through them.

You might want to check & see what it is that is actually leaking, coolant or ATF, and where it's leaking from, coolant leaking past the AT fittings would suggest the bottom tank is compromised, pray that you don't have coolant leaking in to the ATF (or vice versa or you're going to be looking for a new transmission soon

Skinruggers · 2025-10-05T16:47:47-0400

So it is clearly coolant (green and smells like coolant). Doesn't feel greasy/slimy/whatever-the-english-word-that-describes-ATF. Transmission works fine as well. I didn't realize those hoses are for ATF. I guess I will take it apart and see. If the bottom tank is compromised, is it a radiator replacement?

Can't figure out coolant leak HELP PLS

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