The Chevrolet 3.4L (3400) V6 is just one variant of a huge family of 60-degree V6s in production since 1980. Though this engine has seen constant improvement over the years, no amount of evolution will ever eliminate all of GM’s notorious engineering flubs. One stands above all others in this engine family as both easily preventable and endemic, but is nonetheless responsible for countless engine failures and malfunctions.
The main cooling system problems with this engine are manifest in those cars with the third-generation engine, produced i the 1994 to 2003 model years. The problem begins as a minor external cooling system leak and eventually develops into a full-blown flood. Less-observant owners have often tfound themselves sitting on the side of the road with an overheated engine and a sizable repair bill.