2001 Ford Taurus Bubbles in tranny fluid

2001 FORD TAURUS
64,000 MILES • 6 CYL • 2WD • AUTOMATIC
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AB_SOOD
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I noticed air bubbles in the tranny fluid, few weeks ago(when it was shifting bad), the fluid level was not too full / not too low.

I spoke to a shop, and on his advice, I added 1 quart of ATF, and the bubbles disappeared for 2 weeks, and then they re-appeared after 2 weeks.

This time, I added another 2 quarts of ATF, and the bubbles again dis-appeared for 2 weeks, and re-appeared again. The tranny now has lot of fluid.

There is no leak in tranny, I got it checked by the shop.

Yesterday night after driving 40 miles, I checked the fluid, and there were no bubbles.
Today morning I checked again after same 40 mils drive, and the fluid was full of bubbles.

I dont know what changed in these 2 trips, which is causing bubbling.
The fluid is in good shape, and there is no leak in the Tranny.

Kindly advice !!

If the car is driven by removing the Tranny dip-stik, can it cause air bubble in fluid ?
Apr 6, 2009 at 12:50 PM
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JACOBANDNICKOLAS
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Is there a chance the trans is getting hot? Does it have a cooler? And no to the dip stick. Bubbles usualy come from overheating, spinning in snow, ice...
Apr 9, 2009 at 12:09 PM
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AB_SOOD
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The Stock OEM Tranny cooler is installed.
And should tranny overheat in a 30-40 mile trip in the cold weather ?

Can the following cause bubbles:
1. Clogged tranny filter
2. Clogged tranny vent
3. Additive in the Trannt fluid, I added Slick 50 Transmission treatment

Can a air leak in the return line of the tranny, from the cooler, cause bubbles, without causing the fluid leak ?
Apr 9, 2009 at 12:50 PM
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JACOBANDNICKOLAS
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It shouldn't overheat. As far as the air in the return, that can't happen unless the pump is extreamly weak with very low pressure. and even then I question it. A vent or filter could cause this. No to the slick 50.
Apr 9, 2009 at 8:30 PM