Question about 1999 BMW 323 Series

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Overheating: 1999 bmw 323i m series 2.5 ..Installed: new water pump , thermostat. radiator,new Water Reservoir, cap.. hose on top side hot , lower hose cold even when engine is hot..no water circulating at all...removed thermostat and still no water flow ? what could it be ? 911 .. help

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The water pump and thermostat should have solved it. an air pocket can cause that but usually not to that degree.

don't get one of those cheap *** plastic impeller water pump for sissies. Get the metal impeller one. get a cool running thermostat and drill two 3/16" holes in it 180 degreess from each other. you may have installed the t-stat backwards.

Posted on Jun 20, 2010

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Posted on Jan 02, 2017

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Other possible causes include foreign material in the air fins obstructing air flow, or silicate or hard water deposits inside obstructing water flow, or air in the cooling system. Air gets in when you change the coolant, or when the plastic water reservoir starts to crumble and leak internally.
Also, BMW used a plastic impeller water pump off-and-on in the three series through the years. Those plastic pump impellers get old and crumble eventually.

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