Visit a parts store and get a kit that allows you to test the coolant for combustion gasses. It could be a bad head gasket or a small crack in the head.
The test kit will show you if its the head/gasket.
After that check the radiator for blockage, water pump to see if it's actually pumping and other coolant blockage.
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Friday, December 18th, 2009 AT 1:43 AM