Question about BMW 528

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Overheats even after thermostst, water pump replacede. Also took radiator off and shot water thru it with garden hose seemed fine.Its a 1997 BMW 528I> Have no clue other that hoses or lcog somewhere but how do I check hoses and which hoses would have air pockets or even part of cooling system? desperate here after 4 days of work!

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It is more than likely an airlock in the system. BMW are horrible for trying to remove these. Start the engine, remove the bleed nipple next to the rad cap and try using your hand on the hoses to "pump" the fluid through the system. Stop the engine refill the coolant up to the top. and keep repeating until all the air has escaped.
Best of luck.

Posted on Aug 07, 2010

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a way to see if the water pump is pumping coolant is to remove the bleed screw on the thermostat housing and see if coolant spews out.

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