Engine temperatures cummins 350

Totally normal. Our 00 Windsor is mechanically the exact same coach as yours other than some cosmetics, just a year older. Built on the same assembly line. Just remember the variances in gauges as these are electronic and a long way from the engine room. They are there to show the normal operation and when that changes it should be dealt with.

Dave

Our 425 Cummins ISL runs about 195-197 normal on level ground, Trans about 205-207. All go up on hills but not much more than 10 degrees (we have a side radiator). Idling, the engine will fall to about 179.

MM.

The Imperial has a side radiator and the 8.3 ISC (or possibly the ISL) engine. Brett Wolfe is right, the temperature ranges you gave appear normal.

By the way, since you live in Edmonds, consider attending meetings of the local Holiday Rambler Recreational Club. One member has an Imperial like yours, two have Scepters, one a Navigator and several others have Endeavors.

My 350 cummins runs up to 200 on hills when outside temp is 90 to 100 degrees, most of the time it runs @ 175 to 180. I use lower gears to keep up RPM's on hill climbs to help keep the temp down.

Yes. I've a 98 Dynasty with a Cummins 325hp 8.3 ISC. I generally run about 180 deg, up to maybe 200 - 205 deg going up grade.
Remember that a diesel is a completely different critter than a gas engine. Gas engines run better when cooler, and the way to cool down a gas engine is to shut it off.
Diesel engines love to run, and they love to run best around 205 deg. And the way to cool down a diesel is to let it idle. Keeping your radiator, side or back, is key.
My brother drove a diesel van for a service company in Connecticut, and in the winter, because he would often get called out in the middle of the night, he wouldn't shut the engine off, even while he was at home sleeping. During colder weather it wasn't unusual for him to leave his van running for 4-5 days without shutting it off.

180 is low. The range should be in the 195 to 200 range and those numbers will climb as you head up the hill. Is this a side radiator? If so the hill climb temp should peak out around 210 and then the fan controller will come into play and reduce the temps. If a rear radiator, then you will have to raise engine RPM to increase air flow over the radiator and turn the water pump faster.

YES. Only question is how much higher on hills?