Ok i have a 01 deville. the issue is that the resivour tank is bubbling and i have no pressure on my top radiator hose can anyone help. also the car has gotten checked for compression and passed.
These cars with the Northstar engines are notorious for head gasket failure. Have the cooling system pressure tested and the coolant tested for combustion gasses. My money's on a blown head gasket. If that's the case you're looking at upwards of $3500 to fix it correctly! HTH. -Jim