Here’s a pic of the upper radiator hose on a E90,,,,it looks like the hose is on,,,but it won’t clip on,,,the hose just pulls right off. 
Here the hose just pulled back,,,,what happen the car came in with no coolant and hose popped off,,,,,I checked for faults and found the water pump faulty 40 times,,,,what happens sometimes is there to much pressure in the cooling system when the water pump starts failing,,,,and something has to break,,,,sometimes the expansion tank will crack,,,,,but this one the upper radiator hose blew off,,,the upper radiator hose and the radiator upper neck was also damaged,,,the plastic on the radiator cracked,,,,,I recommended a water pump ,radiator and upper radiator hose,,,,the customer declined and drove the car out with no coolant in the engine,,,,,I wonder how far he made it tonight with no coolant.
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bmwtechnician 
Hello BMWTech,
Hope you’ve been doing well. I have a 328i LCI with an N51 motor. I am hitting the 80k mark. I was wondering what type of maintenance I should do right now and maybe in the near future? When should I replace the water pump, t-stat and drive belt? Should I do those now or later?
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Any suggestions? Thank you!
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You can do it now,,,,or you can wait until it fails,,,,when it fails that’s never any fun,,,,so if you like the piece of mind then I would replace them now,,,,it’s a good safety
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