i replaced my coolant expansion tank and replaced the automatic thermastat in the expansion tank. got everything hooked back up and ran my car and it started to overheat. How do i know when the bleeder valve is done bleeding out the air?
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2003 BMW 330xi Question: what do i do when my 2003 bmw overheats
Answer #1Stport from S & T Auto Repair and Racing, March 15, 2012, 18:58Technician
it will be done when no more water or coolent comes out.
Answer #2patrick mannion from Greg Solow's Engine Room, March 15, 2012, 22:39Master
Keep filling the cooling system until it takes no more coolant and all the air is purged out, perhaps fill it and burp the hoses adding coolant running the engine for a few minutes at a time and keep adding coolant as needed when it cools down. Is there a possibility the head gasket may be damaged? The most accurate way to test for a blown head gasket on a gasoline engine is to test for the presence of carbon monoxide in the cooling system. Snap-On, Matco (part # CO 2000), and Napa sell a tool to check to carry out this test. Another link to a supplier of this tool is http://www.etoolcart.com/combustion-leak-detector-lis7550.... Carbon Monoxide is only present if there is a blown head gasket or cracked cylinder head. http://www.arrowheadradiator.com/head_gasket_or_combustio... I think the Napa part number 700-1006. http://www.blockchek.com/instructions.htm . Signs of a blown head gasket are coolant loss (frequently have to top up the coolant level of the engine without seeing an obvious leak), experiencing over heating or rough engine running or the presence of white sweet smelling steam from the exhaust. A badly blown head gasket may allow engine coolant and oil to mix.