<VV> PG questions about aerated ATF

[Frank DuVal]

The air will eventually come out of areated ATF, but how long? Not in a 
few hours I would think.

Areated ATF looks like a strwberry milkshake.

I have had areated power steering fluid that did unareate itself without 
a flush. Just corrected the condition that caused the areation.

The malfunction is that the air trapped in the ATF will compress, so 
fluid pressures will be WAAY off. If enough air is trapped, the PG 
should quit working. The danger point is where it slips before it quits. 
Heat is the enemy of clutches and bands, and slip is heat generating. 
Also the lubricating qualities of the ATF are lower with air trapped, so 
beariings and seals can also be damaged. And, trapping air will make the 
level of the ATF seem higher, just like liquid in a blender gets more 
volume when the air is whipped in.

The cure should be get the level right. No flush needed if the car can 
sit for a few days. This is my opinion and others may differ.

Frank DuVal


steven at sashimi.org wrote:

>I keep reading the ominous DO NOT OVERFILL and that this can lead to
>aeration of the ATF in a Powerglide.  Also, that a bad seal between the
>filter and the valve body can suck air and lead to aeration too, and that
>malfunction can result. 
>
>Beyond this, I have found little information.  I've read the '61 shop
>manual, '65 shop manual, "corvair basics", "how to keep your corvair
>alive", and everything I could find on the web including virtual vairs and
>the Corvair forum archives. 
>
>So does anyone know what malfunction(s) might result from aerated ATF?   
>Will the ATF return to a reasonably non-aerated state (and if so, when)?
>Does the ATF necessarily look aerated?
>Is the cure merely lowering the fluid to the correct level (and/or
>replacing the filter seal) or is a full flush necessary?
>
>Thanks,
>
>- Steve Brown
>
>CORSA / PCA member 
>'69 Monza convertible 140 PG
>'62 Rampside  
>
> 
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