The Northstar engine series is a family of automobile engines designed by General Motors. The Northstar has been used in several cars in the GM lineup, including the Cadillac Seville, Buick Lucerne, Pontiac Bonneville and Cadillac Eldorado. Like all engines, the Northstar requires proper maintenance to stay in good condition. An overheating engine is a definite indication that something is wrong. Run through a check list of common overheating problems to troubleshoot the source of your engine problem.
Check your coolant level. One of the most common causes of an overheating engine is a coolant leak. Start by checking to see how much coolant is in your system.