For 1990-2009 cars

Cause | Correction
--- | ---
Faulty cylinder head gaskets and/or cracking or other damage to the cylinder heads and engine block cooling system passages Coolant consumption may or may not cause the engine to overheat. |

1. Inspect for spark plugs saturated by coolant. Refer to Spark Plug Inspection.
2. Perform a cylinder leak down test. Refer to Cylinder Leakage Test.
3. Inspect the cylinder heads and engine block for damage to the coolant passages and/or a faulty head gasket. Refer to Coolant in Combustion Chamber.
4. Repair or replace, as required.