Quote:
Originally Posted by v8volvo
The more conclusive, direct test you can do to confirm the integrity of the WP impeller (without having to take the whole front of the engine apart to remove the WP) is to remove the thermostat again and look in towards the front. From the tstat opening you can see the backside of the water pump visually (might need a small mirror), and with a screwdriver or piece of bent rod, you can also reach in there and see if the impeller is loose. If you are able to spin that impeller while the engine is off, then you have found your issue.
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Brilliant! Could probably also see if the impeller vanes were corroded into nothingness.