We suggest you replace this when doing an engine rebuild to be on
the safe side. We have seen them get stuck with bearing debree. No to mention it's much harder to get at later when in the car.
Is you car running hot? You have checked everything else but
it still runs hot? Have you checked to see if your oil cooler is getting hot? If this valve is stuck
you may not be circulating oil through your oil cooler.
If your engine coolant is hot, and your oil cooler is ambient, then
this could be your problem.