After tracking down the problem on my 2015 Volt, I replaced the pump PN 13597899. It cost $180 and only took 2 hours to fit - job done, marvelous heat as and when needed - great.
I dismantled the old pump (it was the same number 13597899 as the new one) with a view to perhaps repairing it to put on the shelf as a spare.
Once opened up the problem was obvious, the ceramic magnet that drives the pump impeller had come unstuck from its steel back plate, slid across and got jammed in the pump housing. Yes, the rotor drive magnet is only glued to the steel plate, I can imagine that this might be a common fault.
After cleaning the old glue off with paint stripper and using a high melting point epoxy I re affixed the magnet but then went a step further by making a small brass retainer to avoid the magnet ever moving again - see attached before and after.
Simply re-glueing the rotor have might be enough and might avoid spending money on a new pump that might fail anyway.
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