Date registered: Mar 2007
Vehicle: 2001 ml320 and 2006 ml350 (sold)
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I think it is kind of a toss up on the not driving until fixed. I used to think no big rush, but then when the ml320 waterpump with no other warnings started squealing a bit I went ahead and drove just couple days until pump was replaced. Here is the weird thing: I took off the old felt it, it was kind of gravely no surprise. I set it aside finished the job, cleaned up whatever. Then next day I examined the old one and it would not turn it was stuck.
I think it was basically seized and then starting car broke it free...It could have broken the shaft at any time soon, i would guess.