1995-1997 Buick Riviera Engine Coolant Consumption or Coolant Leak (Inspect for Material Degradation/Replace Intake Manifolds)

download Condition Some customers may comment on excessive engine coolant consumption, or an engine coolant leak near or under the throttle body area of the upper intake manifold. Cause Upper intake manifold composite material may degrade around the EGR stove pipe and could result in an internal or external coolant leak. Correction 1. Follow the [...]