I a 1993 Safarai Continental 38' Pusher 8.3 Cummings with only 27000 on it. Drove several hundred miles to pick it up. Hooked my tow car up and off I went and then I notice my heat gauge creeping up at higher speeds. It hovered just under 225 for about 30 miles. It finally got a shade over and I decided to stop and let her idle. It immediately drops within 5 min to 200 and then makes it way to 175 in about 10 min. I could run again for about the same time and I would redo the cycle. It heats up faster 65-70. If I run 45-50 it holds ok. Its cooler now so I need a fix before summer and the mountains. Could I power wash the side radiator or what? I hope I didn't buy a lemon.. Never had a diesel pusher but love the power and what an awesome 6 speed Allison. Hope its an easy fix. Thanks for your donated knowledge.

 

you have a hydrolic fan that the controller or wax element wich you have they go bad,the fan doesnt go to high.also the radiators clogg between the rad and intercoller or cac. Make sure fan goes to high.runs on low most of the time.Hits high at about 212.Diesels really wont take being over heated dont run it past 215 it will blow. I would suspect the wak element.I dont think yours doesnt have a eletric controller.Feel free to contact me . Master tech 30 years specializing in the 5.9l but they are similar and i also have a 8.3l with side mount.