Ok .. I found that test .. I also remember seeing a Ohm Meter test that could be done before removing the sensor .. This was a cold engine reading .. Engine RPMs will drop if there is a cooling issue ..will unplugging the sensor allow normal speeds to be regained? Providing that the sensor is...
Engine ran in the big tub then high temp warning came on .. I didn't have my temp tester handy to check head temp but I know it was pumping water .. These sensors appear to be nonexistent or $300+ if one is found .. Budget is really tight !!