Faulty cylinder head gaskets and/or cracking or other damage to the
cylinder heads and engine block cooling system passages. Refer  to 
Diagnostic Starting Point - Engine Cooling 
. 
 (Coolant consumption may or may not cause the engine to overheat.) 
 | 
|     •  | Inspect for spark plugs saturated by coolant. Refer to 
Spark Plug Inspection 
 in Engine Controls - 2.0L. |  
  
|     •  | Perform a cylinder leak down test.  |  
  
|     •  | Inspect the cylinder heads and engine block for damage to the
coolant passages and/or a faulty head gasket.  |  
  
|     •  | Repair or replace as required. |  
  
 |