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calling transmission experts and bricknut know-it-alls! 200 1989

uid 18083's pic
posted by  lucid on  Wed Mar 9 07:12 CST 2005
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last visit: Fri Oct 24 12:31 CST 2014
[RELATED]

"Well, since the trans line pressure is much greater than the cooling system pressure, when the cooler fails it is usually a one-way valve and sends atf into the coolant."

Not sure what your question is, but I tend to think that coolant can get back into the coolant when the engine is shut off—contrary to the above.

The tranny pump stops and pressure drops, but the coolant system holds pressure for a long time. Seems like this residual pressure could force coolant into the (leaky) ATF cooler (immersed in pressurized coolant) and possibly into the ATF return line, which could even develop a slight negative pressure when it drains back to the tranny.

The ATF contamination might be small each time, but it would be circulated thru the tranny when running, and added-to with every shut down. This could explain the Coolant-to-ATF cross-contamination, IMO.

--
Bruce Young
'93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.






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