BMW 01 Expansion Tank anti freeze empty in two days

Asked by Oct 19, 2014 at 11:43 AM about the 2001 BMW 5 Series 530i Sedan RWD

Question type: Maintenance & Repair

Expansion Tank anti freeze empty in two days WHY? THERE IS NO LEAK

3 Answers

285,885

There has to be. Look for a wet spot or white reside to indicate dried coolant. The expansion tank will leak from the smallest crack that you can't even see, only under pressure. If it is the original, replace it now with the hoses, thermostat and water pump. www.fcpeuro.com and purchase the coolant system refresh kit.

285,885

Maybe a failed head gasket? How does the oil look?

335

There may be an air pocket in the system. If you have recently flushed and/or done any work with your coolant, it can cause this (mine did it just 2 days ago!). Turn the car on, fill the coolant reservoir with the cap off (MAKE SURE IT IS NOT HOT!!!), and let it cycle. As it warms up, squeeze the large hose on top to "burp" the system. I hope this helps - Good Luck!!

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