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International Automotive Technicians Network
Re: Combustion Gases In The Coolant/Overheating
Posted to Technical Theory Forum on 4/1/2003

When a head gasket goes bad and blows into the cooling system, you are adding air to system and pressure. This causes the cooling system to over work, and it shows up as overheating.

Not a problem on an air cooled engine. Login to read more.