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Tranny fluid in my radiator -next step ?

My rad on my 2000 4-runner is full of tranny fluid

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If tranny fluid is present in the antifreeze, you need a new radiator as there would be a crack in the trans cooler that is within one of the radiators tanks.

Posted on Apr 20, 2009

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Posted on Jan 02, 2017

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Transmission oil in the radiator


If the radiator has tranny fluid mixed in with the coolant, then you have an internal tranny cooler leak. At the one side of the tranny, in the saddle tank, there is a tube. This tube allows hot tranny fluid to enter the rad and be cooled before returning to the transmission. It should be totally isolated and submerged in the coolant tank. Occasionally they can leak, and the two fluids will mix. You will need a new rad to repair the problem. It would also be recommended to have the tranny fluid and the coolant flushed after wards. Oil of any kind does not mix well with coolant, and could cause future damage to the tranny more so than the engine.

May 11, 2011 | Buick Century Cars & Trucks

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New tranny in my 92 ssei now it has tranny fluid in the rad ???????


The transmission and engine are there own entities. Unfortuantly the radiator in some vehicles cool the tranny fluid. Its possable when the coolant lines were disconnected from the transmission or from the radiator, the seal was broken on the radiator where the line goes in from the radiator, so you wont see it because its internal. This will allow trans fluid to enter into the radiator. Be careful with trans fluid mixed with the coolant may cause engine damage. Your solution to the problem if this is infact the source would mean replacing the radiator, if you do this be sure to flush the coolant system to rid trans fluid.

Mar 21, 2011 | 1992 Pontiac Bonneville

4 Answers

I have a 2001 monte carlo. there is oil in my radiator. does anyone know the problem could be with my car? my car runs fine.


Are you sure it is oil and not just old corroded dex cool? Just asking because about the only way to get oil in the radiator is through a bad head gasket or cracked head which will usually cause the vehicle to run poorly. Here is a few pics of what dexcool can become. jsmes1027_2.jpgjsmes1027_3.jpg

Feb 15, 2011 | 2001 Chevrolet Monte Carlo

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Radiator fluid leaking, not from radiator or hoses going into engine block. Comes out from above transmission pan.


If the leak is back there? sounds like an intake gasket or head gasket if you ruled out the hoses

Jun 11, 2010 | 2000 Ford Taurus

1 Answer

Describe your how do i replace 1993 jeep Cherokee radiator


Start steps when vehicle is cold. Drain the rad fluid - located passenger side lower bottom of the rad. When draining remove the rad cap (keep your bucket there for complete job). After empty, the tranny lines must be removed, a tool is available for this - from Parts Source or UAP. They join at the bottom of the rad, after removing (don't break the clips or lose them) keep the lines upright to avoid draining the tranny fluid. Undo the 2 bolts holding the fan shroud, slowly and gently push the shroud towards the motor (do not bend the tranny lines attached to the rad). Then lift up and move to the motor. Undo the clamps holding both rad hoses, drain the bottom hose into the bucket. Undo the 8 screws or bolts (10mm ??) holding the top plate that keeps the rad stationary - the hood latch is connected to it, move it towards the front of the vehicle. Pretend you are dismantling a bomb, one wrong move and you will be replacing more than a rad. Lift the rad straight up, watching everything in the way. With the rad on the ground with the tranny lines pointing upright, spray WD40 on the tranny lines and undo them (inspect for any holes). Be smooth when you do it or you will be buying new ones. Start with last step first when you install new rad.

May 10, 2010 | 1993 Jeep Grand Cherokee

1 Answer

I have a 1986 v w jetta . my question is how do i put water in my rad as it has no cap .and how do i put tranny fluid in as well


if its an Auto u put the fluid down the Dip stick pipe for the Automatic Transmission and the water goes in the water resivour next to the Radiator it will equalise with the radiator water

Mar 24, 2010 | 1986 Volkswagen Jetta

2 Answers

I need help, have tranny fluid in my radiator.... i have been rebuilding a 94 f-250, 2wd, e4od tranny, 5.8liter. , and my tranny fluid is milky, changed radiator, and problem still exists.. do i have my...


The only way that tranny fluid could get into the radiator is through the transmission cooler, which is inside the radiator. Maybe the replacement rad is NFG. In any case, the torque converter holds a lot of fluid, so just draining the tranny oil pan isn't enough. The torque converter needs draining as well to get all the bad stuff out. You probably just didn't get all of the old fluid out of it. Good luck with that.

Feb 11, 2010 | 1994 Ford F250 Supercab

1 Answer

How to take out my 1993 jeep cherokee grand laredo 4.o radiator. in line six cid


Start steps when vehicle is cold. Drain the rad fluid - located passenger side lower bottom of the rad. When draining remove the rad cap (keep your bucket there for complete job). After empty, the tranny lines must be removed, a tool is available for this - from Parts Source or UAP. They join at the bottom of the rad, after removing (don't break the clips or lose them) keep the lines upright to avoid draining the tranny fluid. Undo the 2 bolts holding the fan shroud, slowly and gently push the shroud towards the motor (do not bend the tranny lines attached to the rad). Then lift up and move to the motor. Undo the clamps holding both rad hoses, drain the bottom hose into the bucket. Undo the 8 screws or bolts (10mm ??) holding the top plate that keeps the rad stationary - the hood latch is connected to it, move it towards the front of the vehicle. Pretend you are dismantling a bomb, one wrong move and you will be replacing more than a rad. Lift the rad straight up, watching everything in the way. With the rad on the ground with the tranny lines pointing upright, spray WD40 on the tranny lines and undo them (inspect for any holes). Be smooth when you do it or you will be buying new ones. Start with last step first when you install new rad.

Feb 02, 2010 | 1993 Jeep Cherokee Country

1 Answer

How to remove 2002 ford taurus radiator


Remove the rad support cover, remove the electric cooling fan and shroud, disconnect the tranny cooler lines, drain the cooling system, remove the upper and lower hoses, remove the rad brackets on top of the rad (one on each side), have someone hold the AC core out of the way and carefully slide the radiator up and out

Nov 22, 2008 | 2002 Ford Taurus

1 Answer

Radiator vs. transmission


same issue. tranny fluid is cooled via intercooler that runs along bottom of radiator. this developed a crack and because tranny fluid is under more pressure, started dumping tranny fluid into radiator. A couple guys recommended replacing rad, then servicing tranny just in case any coolant leaked backwards.

Jun 10, 2008 | 2004 Dodge Neon

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