Engine water temp-What is considered high?

frankiebIII wrote:
Hi all,
I have a 2005 Monaco Diplomat with a 400 hp Cummins diesel, I have owned it for 4 years. It has been problem free and runs great. However, the 4 times I have taken it over the Grape Vine steep grade the engine water temp creeps up over the 200 marker. When it gets to about 225 I start to hear a faint squelching/light beeping sound from by my left leg. As it gets to about 230ish it becomes a full blown beeping sound like when a car door is left open on an automobile. No warning lights come on and my RV is equipd with a engine warning light, a check engine light and a Stop Engine light. As I go down hill the beeping slowly fades as the engine cools until it goes to a light squelch and then disappears. I am assuming this is some sort of warning.

Is it a warning?
Does anyone else get this warning?
Is my engine running too hot?
What can I do to bring the temp down when going up a hill as I do have the peddle all the way down? Should I drop my speed to a crawl like the semis do?
Should I pull over and let engine cool and if I do that do I rust sit and let it idle or turn off engine after it idles a few mins?

Thanks for any education you can offer!

the noise u hear is a factory overheat beeper. 230 is hot.For a short distance no problem,Big question is R U having to add fluids after this or not.Grapevines a long hard pull best to select 4 th gear or 3 rd gear and just slowly pull your way to the top running in the 2-21 rpm area.maybe try running a HP water hose through the CAC and side mounted rad. maybe getting pretty dirty
Have you ever stopped and made sure the fans running full RPM when getting these high temps?