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 - Vehicle.

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

• Inspect for spark plugs saturated by coolant. Refer to Gas Engine Ignition Spark Plug Inspection for the 3.6L engine.
• 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.