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Old 11-21-2012, 11:57 AM
rgk330i's Avatar
rgk330i rgk330i is offline
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Location: Fairfax, VA
Join Date: May 2002
Posts: 248
Mein Auto: 2013 335i M-Sport
It's not a difficult job. As others have said, certainly replace the expansion tank. And while you're at it, replace all the hoses and probably the thermostat. If the water pump is the original, consider replacing that too. This starts to become a bit of work, but would you rather replace it on your schedule, or have it go boom out on the road?

Follow the cooling system bleed procedure carefully to get all the air out of the system.

Some pics from my replacement:

Oh, and if you replace the lower radiator hose, plan on replacing the temperature sensor too, because the shrunken O-ring won't seal properly when you replace it and it'll leak. I got away with it by wrapping a bit of teflon plumber's tape on the sensor beneath the O-ring to bulk it up a little bit, so you might try that.

2013 335i M-Sport, ED May 2013

Last edited by rgk330i; 11-21-2012 at 12:00 PM.
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