Join Date: Feb 2007
Location: Carrollton, Texas
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I would not try to find the piece by disassembling anything major. If the piece were to get stuck in an undesireable place, it would probably be in the thermostat itself. If you've put several hours on the enine since the impeller change with no problems noted you're probably in the clear.
The missing piece will probably only make itself available at the worst possible time. Heat exchangers and thermostats usually catch the missing parts. A resulting problem may or may not be immediately apparent.
I'm sure there will be some more advise given shortly that may relieve your anxiety.
Opportunity is missed by most people because it is dressed in overalls and looks like work.