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- - 2003 Seville (https://www.cadillacforum.com/forum/automatic-transmissions-57/2003-seville-16672/)

DSawyer

01-07-2016 10:08 AM

2003 Seville

I have to add about a quart of fluid every month. I cannot find any leaks. Could it be a bad vac modulator valve? Does a seville have a vac mod valve? Any help would be appreciated. Thanks.

Adams' Apple

02-11-2016 08:55 PM

No modulator on the 4T80E. Check your cooler line hoses that go to the radiator...they will "weep" fluid, and not drip anywhere.

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