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Vanishing Transmission Fluid ?
Posted 08 November 2003 - 12:31 PM
I have noticed that on my 92 Loyale, auto, and 4WD that runs and shifts very smoothly.
However, the automatic transmission fluid slowly disappears (about 1/3 quart) after a month.
I have parked the car on papers overnight but cannot find any leaks!
Where's it going?
Posted 08 November 2003 - 02:24 PM
Check the vacuum line running to the modulator. Is there any fluid in it? If there is, the modulator is bad, and your trans fluid is being sucked into the engine.
Check the front diff oil as well. If your front seal is failing, your trans fluid could be going into the diff. Usually it happens the other way around, but it's worth a look anyway.
Posted 08 November 2003 - 02:43 PM
Posted 08 November 2003 - 02:51 PM
Originally posted by subarubrat
Also, if your car has a tranny cooler, and of course the lines running to it, check those, the tranny cooler may be damaged or rotting.
Good point... especially since the stock trans cooling lines run to a chamber at the bottom of the radiator on an EA82.
Posted 08 November 2003 - 05:29 PM
Where is the modulator located?
And where dose the vacuum line running to it start from?
Also, is the transmission cooler on the bottom of the radiator?
Anything else to look for?
Posted 17 November 2003 - 11:40 PM
So... I put some transmission stop leak in the AT. It worked! It's been 2 weeks now and I think the leak has stopped.
Now the question is...
1. Do I drain & refil the transmission with regular fluid?
2. Do I drain & refill the transfer case? It's only 2/3 quart over.
Posted 18 November 2003 - 09:44 PM
Subarus have no real transfer case per se. The section that the rear drive shaft slips into is actually part of the transmission and has no dipstick to check.
Are you saying that the reservoir that you check just behind the engine is getting trans fluid in it? The one with the short thick metal dipstick? That's the front differential.
If you're getting trans fluid in there, this transmission will need a rebuild. Stop leak will allow the trans to stay sealed longer, but it will eventually start leaking again. Eventually this leak will destroy the input shaft bearing and the transmission will SEIZE.
When it starts leaking again, it's time to consider changing the tranny.
Posted 18 November 2003 - 09:53 PM
The short metal dipstick is a little bit beyond it's full mark. So i'm guessing that's where the missing automatic transmission fluid went to.
Funny thing is... the car still shifts smoothly and the 4WD drive works great!
Can I get by for now by just changing the fluids or should I just leave it alone?
Also, what happens if the front differential has too much fluid in it?
Posted 18 November 2003 - 11:21 PM
Posted 19 November 2003 - 03:11 AM
ither that or spend $$$ to have it fixed, or another auto that is hopefully in good shape.
as long as you dont let her run dry. and atf in the diff shouldnt hurt anything, if the leak is slow enough, you can keep it in check. my .02
but maybe you can consider a 5spd swap!
Posted 19 November 2003 - 07:06 AM
I stand corrected... it was only over by 1/5 of a quart.
Posted 19 November 2003 - 09:09 AM
Posted 19 November 2003 - 10:02 AM
Check the level every 600 miles or so, and rebuild if/when it comes back.
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