Question about 1996 BMW 318

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Its over heatingwe had just changed the water pump and the car starts to overheat?

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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

  • Jimmy Marksberry Nov 02, 2011

    Thanks for the post!!! I've tried everything and this worked.

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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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1 Answer

1998 Toyota camry.. Is having problems to get heat through the car. Changed the cars thermostat and add coolant. Still no heat.


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Water pump. The impeller will slip on the shaft. As you said runs fine at idle, but when you run it harder the impeller doesn't spin fast enough (slips). Causing it to over heat. replaced to many for this problem. Also The pumps that have the metal impellers will be tight when cold, don't let this fool you. when they heat up they slip.

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Did you have your heater running when you refilled coolant after water pump changed?

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