1996 Buick LeSabre intake manifold

166K, Think I blew a gasket. Started with white smoke coming from exhaust pipe, and a loss of power. Stopped and checked engine. Oil level up, coolant very low, Now engine will not start. Culd be hydro-locked? Do I just need to replace upper intake manifold assembly or could this go deeper? Thanks, C

Check the area below the throttle body for coolant leaking onto the bell housing of the transmission. If there’s coolant in this area, the EGR port in the plastic upper intake plenum has failed and is allowing coolant into the lower intake manifold. Now the question is, how long has this been leaking? And did it do damage to the engine bearings?