Quote:
Originally Posted by m5james
Goto ww.e38.org and educate yourself on how to bleed the cooling system. You CANNOT use tapwater to top off the cooling system, only distilled water and either BMW or Zerex G05 coolant only.
Since this is happening, I can almost guarantee the rest of your cooling system components are going to start breaking as well since they're all the same plastic that your expansion tank is made out of. You'd be far better off to just replace everything in the cooling system, but it's up to you with winter coming up right around the corner.
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It's a good point,I would definitely listen to m5james and go ahead with the cooling overhaul.It's gonna be less expensive than any engine involved repairs.