Hey all, I'm a new poster, long time lurker, and a 08 550i driver. Yesterday as I was on my home from work my power steering went out and my car notified me that the dynamic drive had a charging failure (talk about a heavy steering wheel). Not too long after that I receive a low coolant and pull over at a close by safe location. When I looked under the hood I saw the drive belt sitting off the pulleys and coolant sprayed all over the engine compartment. I have not had the chance to take a close look at the damage but I'm going to assume I had a water pump failure (possibly the pulley failing) causing the belt to slip off.

Ordered parts:
Water Pump
Integrated Housing Thermostat
Thermostat / Thermostat Housing / Water Outlet Seal
Temperature Sender / Sensor
Coolant Pipe & O-Ring
Billet Aluminum Water Pump Pulley

Am I missing anything or anything else that could be impacted? I'm going to check for hose leaks once I can get into the car.

 

Definitely get a new belt. and coolant of course. Check also the expansion tank for cracks or burn marks from the belt.

 

If the belt came off first for other failure, the coolant may just be from overheating, make sure to check all things driven by that belt.

 

The only thing I would suggest is getting a tensioner. If not the belt might keep coming off and you may have continued pump issues. Make sure you if you do not get BMW coolant then buy 100% with distilled water but I would only suggest BMW brand to keep your radiator clean.

 

Full agreement on the coolant, if you can't get BMW coolant then anything with ethylene glycol (which is almost everything except Dex-Cool) would work.