Has always run like a dream. Did a garden hose flush, only clean water (no crap) came out the pee hole. I have changed both thermostats, the pressure relieve (poppet) valve, and the impeller. With garden hose and muffs on, it does not pee water and overheats (and beeps) after about 5 minutes at idle. What else could this be?
I DID notice that when I replaced the impeller that there was a small gap between the plastic impeller cover/housing and the metal plate. I got just the impeller and metal cup kit, and not the kit with the new plastic cover. I also noticed that the original plastic cover had a lot of hardened sealer between the cup and the plastic cover. I could not remove the hardened sealer from the cover and think that might be why I have the small gap between the cover and the plate. Does the impeller have the be perfectly tight in order to work properly, create water pressure, and make the engine pee?