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I don't think impeller blades check will provide much info - waterpumps either work or start to leak around the seals, then eventually will fail ... I don't think I've seen a "weak" one.
If you don't have good pressure in the system due to a bad seal on the waterpump it can cause strange things to happen - check the waterpump weep hole to see if you are getting any seepage.
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George Stephenson
1991 350 SDL (200K and she ain't bent, yet)
former 2002 E320 4Matic Wagon - good car
former 1985 300 CD - great car
former 1981 300 TD - good car
former 1972 280 SEL - not so good car
a couple of those diesel Rabbits ...40-45 mpg
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