1994 Cadillac Seville Owner's Manual - Page 280

To Add Coolant If you need more coolant, add the propermix at thecoolant surge tank. To Check or Add Coolant When the engine is cold, remove pressure cap from the surge tank; the use a flashlight as necessary to see into thetank. The coolant level should be visible insidethe tank. If you need more coolant, add the proper mix. 267