Cylinder head gasket faults (Audi A4 B5)

Identification feature	Reasons/Features
A. The coolant level is constantly dropping slowly	Coolant enters the combustion chambers in very small quantities. This phenomenon can continue for a long time without the presence of other symptoms. Another possibility: a leaky cooling system
IN. A trail of smoke trails behind the car when it is at operating temperature white smoke, significant loss of coolant	A significant amount of coolant penetrates into the combustion chamber, evaporates there and exits through the exhaust system in the form of a white plume
WITH. With the engine running, the expansion tank is open air bubbles rise from the tank or when the locking cap is opened, an increased amount of coolant flows out	The exhaust gases are squeezed into the cooling system. The radiator opening smells of exhaust gases
D. The surface of the coolant is overflowing with all rainbow colors or painted black	Oil from the lubrication system enters the cooling system
E. Gray or brown looking emulsion on the removed dipstick to measure the oil level, or the oil is riddled with liquid bubbles	Coolant has entered the lubrication system. Caution: Water in the engine oil can damage the bearings. Replace the head gasket immediately cylinders. Do not start the engine again! Send the car for repair