Question about 2001 Hyundai Elantra

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Transmission oil leaking from radiator - 2001 Hyundai Elantra

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  • Anonymous Mar 18, 2014

    transmission fluid is leaking into radiator.

  • Anonymous Mar 18, 2014

    what can be the problem of transmission oil leaking into radiator

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Either you have loose connections for Transmission cooler in rad, or your tranny cooler in the rad is defective. First, check the transmission lines and connections to the rad. If they are tight you'll have to either replace the rad or put an exterior tranny cooler on your car.

Posted on Jun 04, 2009

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I just had a leak one mine that dripped onto the exhaust and smoked out the drivers compartment if you sit long enough. It wasn't the fittings themselves. It was a hole on the aluminum line that comes off of the passenger side between the radiator and the rubber lines that are behind the cooling fan. Smaller than a pin hole leak and impossible to see. I plugged the hose and blew into it and I could hear the leak. It rubbed a hole through where the fan bracket connects. Going to try and replace it with steel brake lines.

Posted on Jan 01, 2015

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Posted on Jan 02, 2017

Molson02536
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SOURCE: oil leak after radiator change

The radiator has a transmission and engine oil cooler lines to it too. One of the oil lines are leaking, if you know which one that's have the battle. I believe the transmission line is on the passenger sides and the oil cooler line is on the drivers side. Look at where the lines connect to the radiator and see if there is signs of the leak. You may need to spray it down with brake cleaner if you not sure if it's a new leak or old leak from the accident. Good luck and hope this helps. And what do you mean by rear case gasket?? You mean the gasket that connects the transmission to the transfer case, or the rear O ring yoke gasket.

Posted on Jun 12, 2009

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Power steering fluid leaking into engine oil sump, even while stationary


PS fluid cannot possibly leak into the engine oil. They are completely separate systems isolated from one another.

The only fluid that can leak into the engine oil is radiator coolant via a crack in the engine block or engine head or via a damaged head gasket.

On cars with automatic transmissions, there is normally also a separate circuit for cooling the transmission fluid built into the radiator. The oil from the transmission is pumped by the transmission through a second heat exchanger inside the radiator.
This is a separate system but if there is a crack in the radiator where the transmission fluid is cooled it is possible for auto transmission fluid to get into the radiator coolant via a crack in the right area. If auto transmission fluid has got into the coolant an inspection of the coolant will show it.

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Hello Todd, sitting here thinking about it only 2 things comes to mind. First question is it is an automatic. If so then your transmission oil cooler inside the radiator has a leak which in turn it leaking transmission fluid into the radiator. So if it is the transmission do you see any red gunk in the radiator or the water. Now same process if it is motor oil if it is a manual transmission. These new vehicle have motor oil flowing through the radiator to cool off the motor oil also known as the oil cooler. 9 times out of ten all you have to do is buy a new radiator or remove the metal or rubber lines running to the radiator and splice them together with high pressure hose. Which I recommend power steering return 3/8 hose, tough stuff. Just slide the rubber hose over the tube and clamp it down tight with a hose clamp and give it a whirl. But first I recommend you flushing the radiator. Good luck.

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1 Answer

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Normally if oil or transmission fluid mixes with coolant it will turn milky looking like a milkshake. Your leak must be pretty fresh. from your description that it is coming out of the coolant overflow I am thinking you have a radiator transmission cooler leaking into the cooling system.

You will need a new radiator and possibly all the coolant hoses if they have become soft from the transmission fluid.

In most cases if your getting transmission fluid in the radiator it is cause by a bad transmission cooler that is built into the radiator and the fix is to replace the radiator.

The repair will change in price from where the leak is coming from. If the pan is leaking or the rear seal your looking at $100.00 or less. If the front seal is leaking then around $550.00. The most common leak is the pan gasket. Also if the transmission fluid and filter have not been replaced in the last 30,000 miles and the pan is leaking then I suggest doing this also why the pan is off .

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

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Oil leak after radiator change


The radiator has a transmission and engine oil cooler lines to it too. One of the oil lines are leaking, if you know which one that's have the battle. I believe the transmission line is on the passenger sides and the oil cooler line is on the drivers side. Look at where the lines connect to the radiator and see if there is signs of the leak. You may need to spray it down with brake cleaner if you not sure if it's a new leak or old leak from the accident. Good luck and hope this helps. And what do you mean by rear case gasket?? You mean the gasket that connects the transmission to the transfer case, or the rear O ring yoke gasket.

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So if there is transmission fluid in the radiator, I'd look for a leak in the radiator. If it is mixing the two fluids then the leak is probalby internal.

Remember that if the radiator is now 'mixing' water and transmission fluid, there is a possibility that the fluid/water mixture may be going back into the transmission as well

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