Question about 1999 Buick Regal

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New radiator and the transmission lines is leaking at the line connection to the radiator

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Check the end of the line for cracks and make sure you have a clamp on that connection.

Posted on Mar 25, 2011

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Whoever installed it either did not get the connections tight enough or they have crossthreaded it...undo line that is leaking and attach it again using a little teflon tape this time.. these have to be tight.. also, you may need to check your fluid level in your transmission now also

Posted on Mar 25, 2011

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1 Answer

2011 hhr transmission line connections to radiator


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Lucky it aint the other way around. The transmission cooler is inside the radiator and it's leaking under pressure. On the passenger side of the radiator you can see where two metal lines connect to the radiator. These are the transmission cooler lines. Your best bet is to install a new radiator. Depending on where you live and your driving conditions you can also install an external radiator cooler which mounts in front of the AC condenser, behind the grill. All you have to do is disconnect these two lines at the radiator, plug the holes and connect the new cooler to the lines. Cost about the same for a good external cooler as a new radiator.12_28_2012_2_06_16_am.png

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Crossing the lines would not cause a leak. i think you need to take a good look at the lines and see if its the connection to the radiator or a rusted line or bad hose, some of theses came with the trany lines being all rubber hose from ****** to radiator and some were rubber and then change to metal tubing , anyway it doesnt matter which you have but i will bet its leaking from the lines , it may be the line itself or the connection at the radiator, clean the area with some engine cleaner and rinse off then run the engine and watch where the leak comes from, maybe the line just needs tightening. good day.

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The two lines that you are wondering about are oil cooler lines for your transmission. One is a pressure line from the transmission, the other is the return. Usually only a small amount of transmission fluid is lost during a radiator change, but all you need to do is to check for leaks on the line connections, and if they are good, then check your transmission fluid level after you are finished and top off if needed.

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Make sure you don not run low on transmission fluid in your transmission. Low transmission fluid will cost you a new transmission. You have the transmission line that connects to the upper passenger side or the radiator and the lower passenger side of the radiator. Determine which line has gone bad and you can buy a rubber transmission line hose at most Auto Parts store like Parts Source. Cut off out the section with a pipe cutter that has corroded through and replace with the transmission hose. Make sure you tell them it's a transmission line hose your looking for and don't use any other hose and double clamp with a compression clamps at ether end. If it's the connection at the radiator that has gone bad, replace that end and do that same as you would to sectioning off the the corroded line and try not to have more then 3 inches of repaired section. What ever you do, do not add any stop leak, this will create problems with the shift solenoids and check valves in your valve body in the transmission causing a transmission replacement soon after adding. Good luck and keep me posted.

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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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