We have just come back from a 5700 mile trip from Boston out 90/80 to Denver, Tetons, Yellowstone, Salt Lake, Cheyenne and back to Boston. The trip was everything we hoped it could be. This was the first long trip in a new to us 09' Sportscoach Legend 500 TG with a Cummins ISM 500 and an Allison 4000.
Early on the way out we started getting "Check Cooling System" warnings. The operating gauges were all indicating ideal operating conditions. I called Freightliner and was advised that there can be false warnings and since the engine temperature gauge was indicating a normal range then there was no immediate critical issue and I should have it looked at when I get back . I dropped it off at Freightliner today. The ambient temperatures during this trip were quite high.
As we continued on with the trip I had occasion to use the engine brake and at different times I would get an amber Engine warning and in fact on two occasions got a red Engine alarm. When I received the alarm I would shut the engine brake off and the alarm lights would eventually go out. I stopped using the engine brake and was not happy on those 7% grades in the Rockies.
I am reaching out to the FMCA community to see if anyone else has experienced such a situation. We appreciate your feedback and thank you in advance.
"Poppo"
09 Sportscoach Legend 500 TG
Allison 4000