I think it applies to GM products with the 3.8 litre "K" engine. On my 95 lesabre the 8th digit of the VIN is the engine code. If it is a "K" and you have the plastic upper intake check your EGR valve plumbing. The hot exhaust gas hose will melt the plastic intake. Also search the pontiac bonneville directory for coolant loss for more info. I am not sure which model years are affected by this.