Question about 1998 Pontiac Bonneville

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Just replaced radiator in '98 bonneville and now is leaking tranny fluid from bottom tranny line coming inot radiator. line and fitting seem fine. any suggestions?

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  • Jeff Turcotte
    Jeff Turcotte Aug 26, 2010

    did you try some nylon tape on the threads?

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  • Pontiac Master
  • 540 Answers

Unfortunately its a sealed unit in the radiator tank, take the line off and make sure the fitting is properly seating, hopefully its the just the fitting

Posted on Aug 26, 2010

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1 Answer

Installed a new radiator - now a small trans fluid leak at bottom of radiator where trans fluid enters radiator.


You didn't get anything cross-threaded, hopefully? I don't know year--make--model--engine size of vehicle?

Usually when I mount a new radiator, I set the radiator in place, then hook up the tranny lines, first, before the radiator mounts, incase I need to move the radiator a little, to get the threads on the tranny lines to match up with fitting threads on the radiator. I usually tighten the tranny lines last.

Take the leaking line loose, check to see if threads look ok? You may have to take radiator mount loose, so you can move the radiator a little to get threads to match up properly. I haven't used thread tape on plastic lines, I guess you could try it, if else fails?

May 28, 2015 | Cars & Trucks

1 Answer

Transmission problems


Well, the car is 20 years running on the road, one can expect gaskets and seals to start leaking. If you stop the leak and keep it full, you may be alright. But running low fluid for very long will definitely damage the transmission, so do get it fixed, and keep it full but not overfull till fixed. There aren't that many places for an automatic to leak. There are axle seals where the two front axles go into the transaxle. Fairly easy to replace. There is a gasket where the bottom fluid pan bolts to transaxle. Also fairly easy to replace. There are two fluid cooling lines from transaxle to radiator or to a small radiator-like cooler in front of radiator. Leaks can develop in the lines, at the fittings where they connect to transaxle or to the radiator. Leaks anywhere there should be fairly easy to fix. There is another seal, a front transaxle seal, and if bad, fluid will be dripping off the bottom front of the tranny where it mates to the engine. If this seal is bad, the transmission will have to be removed from vehicle to replace it. A $5 seal, but the fix requires pulling the transaxle-ouch! That is about all the places where leaks can develop-except there may be some bolted on or screwed in fittings (like the reverse light switch, for one). These fittings would have seals, O-ring seals, or gaskets that may start leaking.
If it gets low on fluid that fast, it would seem that you should be able to spot where it is leaking. Use rags and wipe off all the old fluid and dirt from the transaxle. After a drive and then parked, you may be able to see where the leak has allowed new fluid to escape. Good luck.

Jul 15, 2013 | 1992 Plymouth Voyager

1 Answer

2000 impala red circle recessed in radiator is leaking replace repair? ect...


It seems that the "black bolt" is the bolt-shaped sheet metal around the fitting for your trans cooler line. If you are certain that your connection is good and the leak is coming from around that fitting then you will have to replace your radiator as the area around the fitting is probably cracked. Take a good close-up look, with an inspection mirror and a light, to try to determine from where the fluid is leaking.
Does your other line have an O-ring?

Nov 28, 2011 | 2000 Chevrolet Impala

2 Answers

I have a red leak that appears to be dripping from the 2 lines that run near the housing of my 94 blazer. I noticed two separate drip trails parallel from each other, about a foot or so, when I backed up...


Yes it sounds like the tranny. Possible an easy fix though. There are two line that go from the tranny to the radiator or possibly a trans cooler. The connections may be lose. There is a cheap way to fix this and that is buying the brass barbed hose fittings that will screw into were the existing line go into the tranny and get transmission cooler hose and run new lines. Or replace it with original parts. I would like to say you are probably be fine to drive it as is just make sure to keep fluid level full. But if they come completely out or break lose you will be stuck and will lose all 7 to ten quarts of tranny fluid. Also when you check you tranny fluid it has to at operating temp and the engine running. Good luck hope this helps.

Jun 18, 2011 | Chevrolet Blazer Cars & Trucks

1 Answer

I'm working on a 2002 Dodge Neon. The transmission cooler line has become disconnected from the radiator but looks to be fine including the adapter. I can push the line back into the hole in the...


I had the same problem with my 2002 Neon and the transmission fluid was mixing with the coolant. You cant fix it yourself...Either pull the radiator and take it to a rad shop or replace the rad as I did. If the coolant gets into the transmission you will also need a transmission flush.The fitting you are talking about has come loose from the transmission cooler tank inside the rad.Its a common problem with neons I got a new rad from NAPA and changed it myself, and it was a lot of work. Good luck. The manual also says to replace the flexible tranny lines.

May 08, 2011 | 2002 Dodge Neon

3 Answers

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

1 Answer

I have a 98 grandvoyager. I have trany fulid in the radiator. and a water leak that appears to be coming from where the hard line go in to the block. It looks like tranny fluid is leaking from there as...


I had the same issue with my Caravan....Needed to replace radiator, however, water in the transmission fluid will ruin the transmission...don't drive it! See a transmission specialist....Hope this is helpful.

Oct 23, 2010 | 1997 Plymouth Grand Voyager

3 Answers

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

2 Answers

Leaking transmission fluid


Could be a leaking transmission line, or leaking at the fitting at the radiator.

May 28, 2009 | 2003 Ford Windstar

2 Answers

Transmission fluid leak


It's probably a transmission cooling line that comes from the transmission and connects to the radiator, which cools the fluid, and returns it thru another line in the radiator. It could be loose, but It probably is rusted, based on the fact that it's 13 going on 14 years old, and probably needs to be replaced, as the leak will just get worse, and if the fluid gets too low, u can ruin your transmission. The steel cooling lines are available at any parts store, both the lines should be replaced if one is leaking. Parts for this are cheap, but labor to snake 5 or 6 feet of line ( x 2) from tranny to radiator takes a bit of time. countrycurt0

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