Leaks are known to develop in the cooling system. It is common to see more than one part recommended for repair/replacement due to overlapping labor and the use of many plastic parts in the system.
Average mileage: 118,545 (65,000–185,000)
21 people reported this problem
I own a 97 540i and i had a new radiator and hoses put in and new expansion tank installed and after i put the expansion tank in about 1 month or so. I was driving it home and it lost speed! so i pulled it over and had it towed. the results where an blown engine???? How could this happen with out any warning lights or anything the coolant indicator read normal! now my warranty want pay because the said i overheated the car!!! I would never do such a thing to something i love and adore. Please if anyone can give me some advice or how and what happen please let me know.. Thanks...
Radiator, water pump, expansion tank, and thermostat
I have to add coolant every 3 to 4 months about 500 milliliters, the problem has existed since i got the car 120000 miles ago, I have had multiple attempts at fixing with different mechanics none of which have succeeded