Bubbles in the radiator or in the coolant overflow tank indicate that combustion gases are being forced into the cooling system. A loss of fluid leading to an overheated transmission can be devastating as the system loses its ability to cool. I have done the intake manifold gasket replacement myself so I'm not too afraid of trying...just what kind of special tools may be needed? In my case (2001, E39, 540i) I replaced the O-ring at the junction of the cooler line with the radiator. Permalink | Reply. Mar 09 2019, 2:08am. I still have the lines sitting in my garage taking up space. If you see a puddle on the ground or smell coolant in the car, you've discovered a serious sign of a coolant leak that needs to be repaired before it causes serious damage to your engine. Do not remove the upper and lower transaxle oil cooler fittings from the radiator at the same time otherwise the transaxle oil cooler will fall inside the radiator end tank. Is it coming out around the tube or the threads? Hi there. Send Private Topic View Profile . Many individuals will think the head gasket is blown. The upper oil cooler line connector at the radiator has been leaking very slightly for a while, I need to replace it, and can't find the correct fitting at any of the parts stores. My truck appears to be leaking coolant from the transmission line connection to the radiator. A lot less expensive and more common then I think most realize… under 100 bucks vs over 1K to 2K to 3K maybe that is what so many that pay to have their engines repaired end up with the …. If the fitting is leaking at the radiator then you need a radiator. A new engine is usually able to maintain its coolant in the radiator, hoses, and coolant passages. It is where the tranny fluid comes out of the radiator and heads back to the transmission. A blown head gasket typically affects the engine’s performance. https://www.yourmechanic.com/article/symptoms-of-a-bad-or-failing-oil-cooler Look for a telltale red, pink, green, or blue puddle under your car or inside your car, as well as residue on any part of the cooling system. The radiator has a transmission and engine oil cooler lines to it too. OIL LEAK COOLING LINE AROUND RADIATOR Posted by Anonymous on Jan 30, 2013. Not oil, but coolant is leaking from behind them where the metal fittings meets the plastic. Oil cooler lines will usually leak oil, as oil is what flows through those lines. Coolant leaking from transmission cooler line Discussion in 'Engine & Drivetrain' started by muncie21, Dec 12, 2019. Want Answer 0. Stop-leak products are meant for hairline imperfections and minuscule cracks, not the kind of leaks that result in a puddle beneath your vehicle or a coolant smell permeating your car. Similar to a loss of oil, an external oil cooler failure may force all of the engine coolant out of the engine. Clicking this will make more experts see the question and we will remind you when it gets answered. Marv Beasley On March 3, 2013 at 8:47 pm. What Are the Common Symptoms of A Leaking Transmission Cooler Line? I have a puddle of orange coolant on the pavement under the front edge of the right front wheel well liner. I agree,a new radatior and transmission line fittings are a jiffy tite fitting which have a huge advantage over flare nut fittings: do not leak and much easier to remove.There is a special release tool to get the line off,the 3/8 relase tool,same with the eingine oil lines too (if it has those) which have jiffy tite fittings.The engine oil lines use the 1/2 release tool.All you do is pop off the plastic cover just enough,put the tool in making it is fully seated and turn 60 degrees which the line will come off.GM started using the jiffy tite fittings in 1996 and I like them because they do not leak and take less time to remove with the special tool. The oil will run at ambient temp and not at 95 degrees c or hotter and the radiator is not having the load of trying to cool really hot oil. To boil out while driving due to friction created between the various moving parts, flashing to steam every the! A blown head gasket is blown then GO down to just above the oil cooler leak... 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