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It's got to have a little thing to push on it somewhere. I'm not sure exactly which one it is from your pic but here's a bare block with the sensors still in it. I don't know if this will help at all but it's the most I can do at the moment.
Hmm, I am trying to think. I just removed/reinstalled my engine harness a couple of weeks ago. As was said, I am pretty sure there is a tab to push. Sorry I don't remember...
alright, i am doing this since i am replacing my head gasket. I was driving it the first hot day we had and i enjoyed it so much i forgot that it had an overheating issue.