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 pressure test to the cooling system. Refer to Loss of Coolant .
3. Perform a cylinder leak down test. Refer to Cylinder Leakage Test .
4. 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 .
5. Repair or replace, as required.