Hi,
OK and sorry just noticed
"I have started the engine with the auxiliary belt removed and the sound is still there." which would mean no a/c compressor involvement.
If it is a manual you could bump start it (ie not involve the starter). That would be a fairly conclusive indication of starter/pinion problems or not.
Since your starter is relatively new, the starter pinion noise may be being caused because the teeth on the edge of the flywheel are messed up.
On V70s (I don't know about 850s) I am pretty sure you can see the teeth if you remove a 3 inch metal cover plate near the bottom of the junction between the engine and gearbox.
If those teeth are OK then changing the starter would probably be the next step.
A used starter wouldn't cost much.
If they are messed up, then I think that would be a much bigger engine-out job.
Not sure why occurring less when warm.
HTH
Steve
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V70 2.5 Turbo AWD Man. 1999 Red
V70 2.5 10V Auto 1998 Green
C70 T 20V Auto Conv. 2001 Blue, C70 T5 Auto Conv. 2000 Blue
V70 2.5 Turbo AWD Auto 1998 Green, V70 2.5 10V Auto BiFuel 1999 Red (scrapped) V70 20v Auto 1999 Green (scrapped)
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