What should the cooling water pressure be at idle, middle throttle and WOT? After 15+ minutes at WOT then going back to idle the cooling water will start rising rapidly and exceed 190 degrees. When I increase the engine RPM a little above idle I don't see the rapid spike in temperature. I have a Merc Monitor so I can see the water pressure but need some numbers to see if what my motor is doing is normal or in need of a water pump rebuild.