Try checking or replacing the thermostat.
SOURCE: I replaced my water pump and belts on my 96 bmw
ON THE BACK OF THE HEAD THERE IS A PLASTC PIPE WITH TWO HOSES COMING OFF IT THESE TEND TO CRACK AND LEAK WITH AGE SO IF THE LEAK IS FROM THE BACK OF THE ENGINE THEN THIS IS MORE THAN LIKELY THE PROBLEM THEY ARE ONLY£4 NEW FROM GSF I HAD TO REPLACE MINE THE PTHER DAY.
SOURCE: 1988 BMW 735I RUNING HOT REPLACE THE RADIATOR,
Headgasket must be checked. and check that you have enough radiator fluid. Also check for warped/cracked cylinder head.
SOURCE: i have a 318 se auto it gets warb in a matter of
Fill the system up with water and coolant, including the radiator, BMW has a PRESSURIZED cooling system, as the vehicle warms up have your heat on in the car full blast, there should be a bleeder screw either by the expansion tank by the radiator or by the thermostat housing. Sounds like you have either some air bubbles in the system or if you let it overheat its possible you blew the head gasket. Hopefully not, as you let it heat up crack the bleeder screw open (carefully, a little at a time) until you start to get heat in the car usually this happens around the mid point of the temperature reading on the gauge in the car, sometimes it will take longer, like in your case since you dont have a thermostat in it, (which you should), it will take a lot longer. If the car heats up almost to red line shut it down there is something wrong or you dont have the air bubbles out yet.
SOURCE: overheating: 1999 bmw 323i m series 2.5
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.
SOURCE: Hello Sir,
After the car is cool and has been sitting for a while, remove the radiator cap, have someone start the car, the coolant in the radiator should drop a little, and there should be movement, if there is no movement, let the car run for a while, with some systems it won't cycle enough to notice until the engine warms up. If there is still no movement, you likely have a bad water pump and/or thermostat.
Another method as a "just to be sure", drain the coolant overflow tank, and fill it with clean distilled water. Drive the car for a few days (carefully not to overheat it obviously, if the engine is getting too hot to drive normally don't do this test). If after a few days of driving the fluid in the overflow tank is still clear (water), then there is no circulation in the system.
It's usually best to start by replacing the thermostat, and then re-check. If that doesn't fix the problem it is most likely a water pump, or in very rare cases a plugged radiator or coolant passage.
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