Quote:
Originally Posted by ff
Whether it can be done, or not, I think it's a good opportunity to do a complete flush and refill with new coolant. As long as you're already working on the system.
Though, assuming that the 535i is like any other car I've worked on (and maybe it's not?), you can probably replace the hose without draining the radiator or what's in the engine block. If you attach the new hose (one end at a time), quickly, right after removing the original, you should be able to avoid losing some/most of your coolant. Be prepared to catch the stuff that does flow out with a drain pan, though. I'll bet that if you keep the radiator cap on, it won't flow out as fast either.
Top it off, bleed it, and you should be good to go.
But again, I'd take this opportunity to do a full flush and refill.
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Thanks ff; I'll consider the flush, but I want to say in looking at the records from the PO that he flushed the system within the last year. If the fluid looks bad I'll open up the system for sure, and flush her out a couple of times.