FWIF when I replaced mine a couple of weekends ago, my faile pump looked similar to yours, maybe just a little bit less impeller damage. Mine started to leak and then I got some slight chirping noise before i shut it down after about a 2 mile drive home.
I didn't even take a close look at the impeller until after I got the new one back in. No bits in the old coolant and I didn't back flush.
If I had to do it again, I would back flush, espacially the the engine a couple of times. But I don't know what the procedure is.
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Current car
2000 Boxster 2.7l red/black
Previous cars
1973 Opel Manta
1969(?) Fiat 850 Convertible
1979 Lancia Beta Coupe
1981 Alfa Romeo GTV 6
1985 Alfa Romeo Graduate
1985 Porsche 944
1989 Porsche 944
1981 Triumph TR7
1989 (?) Alfa Romeo Milano
1993 Saab 9000
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