BMW Repair Questions? Ask a Mechanic for Answers ASAP
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is the anti freeze still low?
how quickly does it overheat?
there is no heat inside the cabin?
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sounds like potential air in the system. I would be sure to vent/bleed it all out
if you are positive all air is out, then it could be the waterpump or thermostat, or possibly a head gasket issue. this is not likely but is easy to test for with a kit from a parts store that tests for combustion gases in the cooling system.
the bleeding proceedure is:
Turn the ignition on but engine off. Turn the heat on full max hot with the fan set to low.
On the top of the expansion tank and/or in one of the hoses is a bleeder screw. Remove this screw and fill the tank up until fluid spills out of this bleeder hole.
Continue pouring until no air bubbles whatsoever come out of the bleeder hole as the coolant overflows out.
Next, reinstall and tighten the bleeder screw and then turn the car on and let it warm up to operating temp with the heater on in the passenger compartment to full blast.
Then, let it fully cool and top up the coolant tank until full. You may want to repeat a few times to make sure all air is out
I hope that is helpful, please let me know if you have further questions, or if I can clarify anything for you.
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