Question about 1996 BMW 318
Sounds very likely to be an air lock and easily solved. Don't know your exact model, but there is usually a bleed screw on one of the water lines to the heater matrix (it will be at or near the highest water line). DON'T go near any schrader valves as this will be the AC system! Should be a plastic plug which you unscrew, with the engine running, let undo the screw until coolant comes out, then screw back up again, keep an eye on the water in the expansion vessel as you do this. Pretty sure this is the problem.
Posted on Jul 29, 2009
Also check the thermostat (front of the block where the two radiator hoses go) & make sure it opens when it should.
Posted on Aug 01, 2009
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Posted on Jan 02, 2017
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