Overheating issue 1999 HR Endeavor

[rockwrangler]

Well back from a 4 day trip and the weather was nice in the 65-70* range when pulling the hills so there was little chance of a good test to see if the work I did helped.

I am my head as now after putting in a 180* thermostat (That has no temp stamp on it) the engine temp is running at 200* and while pulling hills it got up to 210* and went right back to 200* once the hill was cleared.

Best I can figure is they gave me a 200* thermostat because even if it idled for 15 minutes the temp wouldn't drop below 200* +/- 3-4*.

So things seem to be better but back to the drawing board or another Thermostat to see what the heck is going on. I may flush the Rad again just to be sure it's clean but the first step is to swap out the thermostat.

[Airstreamer6]

I doubt a "colder" thermostat would make a difference in high-stress situations. Any working thermostat should be wide open under those circumstances. Many engines run better and potentially last longer when they don't stay too cool under light load conditions.

The temperatures you cite seem normal to me.

[wb7auk]

Originally Posted by rockwrangler

Well back from a 4 day trip and the weather was nice in the 65-70* range when pulling the hills so there was little chance of a good test to see if the work I did helped.

I am my head as now after putting in a 180* thermostat (That has no temp stamp on it) the engine temp is running at 200* and while pulling hills it got up to 210* and went right back to 200* once the hill was cleared.

Best I can figure is they gave me a 200* thermostat because even if it idled for 15 minutes the temp wouldn't drop below 200* +/- 3-4*.

So things seem to be better but back to the drawing board or another Thermostat to see what the heck is going on. I may flush the Rad again just to be sure it's clean but the first step is to swap out the thermostat.

You can check the thermostat in a pan of water on the stove with a temp
gauge.
From what you indicate they sold you a 190/195 thermostat and not a
180 or it is defective.
With a 180 degree thermostat you should see normal temps of 190
and under a hard pull it might go to 200 / 210 no more.
This is what I find with rear facing rad's that are clean or very close to
being clean.

[HRDavid]

I'd be pretty mad that Cummins didn' rod the radiator with a new engine install.

[walt2137]

RW have you solved the engine run hot problem yet