could it be a solenoid if so which one
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1999 Saturn SL2 Question: car loses reverse when warmed up
Answer #1Bret Bodas from RepairPal Test Shop, March 19, 2010, 11:11Master
This is going to require a diagnosis of the transmission to know where the problem lies, and I can tell you it's not likely a solenoid. I don't suggest you start replacing parts without a proper diagnosis, it will likely be incorrect and a waste of your cash.
Get it looked at for an accurate diagnosis: http://repairpal.com/directory?address=barre%2C%20ma&car_brand_names=Saturn