GM Service Manual Online
For 1990-2009 cars only

Cause

Correction

Faulty cylinder head gasket and/or cracking, or other damage to the cylinder head and engine block cooling system passages.

Coolant consumption may or may not cause the engine to overheat.

    â€¢ Inspect for spark plugs saturated by coolant.
    â€¢ Perform a cylinder leak down test.
    â€¢ Inspect the cylinder head and engine block for damage to the coolant passages and/or a faulty head gasket.
    â€¢ Repair or replace as required.