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[Arkie]

Try just pulling the thermostat to see if the temp settles down. Don't play with this thing too much, 'cause most of my failures have been stuck closed, never to open again. If it settles down, replace the 'stat 'cause you don't want to run too cold. As Calimus said, boiling it in an old pan (water) will also tell the tale. Remember that EG is toxic, so use an old pan that you don't cook in, just to be safe.