Welcome to AF !
I found this TSB;
TSB #071101 -- SOME CUSTOMERS MAY COMMENT OF WATER LEAKING INTO THE CAR ON THE FRONT FLOOR. *TT (NHTSA ID #628102, NOVEMBER 07 2001)
That was all I could locate though at the moment.
I will try and find the full report and I'll post it here
Here is the link where I found that TSB above.
http://www.carcomplaints.com/Oldsmobile/Cutlass/1998/tsbs.shtml
You will be shocked of all the TSB's listed !
I believe thiers over 500 , but they are not all listed
This site lists them all but costs money to view the Full TSB.
http://www.infotraxx.com/browse.php?Year=1998&Make=OLDSMOBILE&Model=CUTLASS
I'll still search for that TSB, I know its eiter you hvac drain clogged or piece foam out under the hood that was mispositioned from the factory.