We've got a "Pac Brake" on ours, and in researching it for a forum member I came on a quote I'd never seen: anyone else have a PB and does this work? If it does, it sure beats fooling around with the block heater. ^.^d
"The Direct Mount features a built-in "warm-up" position that will help your engine warm-up in half the normal time.Turn on your Pacbrake, set the idle speed and say goodbye to white smoke and hello to a quicker and safer cold engine warm-up."
Mike,
I am not aware of any RV that uses the exhaust brake (closed) to speed engine warm up. You can check with PacBrake, it may have something to do with the wiring through the Allison ECM.
And, while it would speed warm up, it would have no affect on starting ability in cold weather.
Guess one could run an additional wire direct to the exhaust brake solenoid and use diodes to wire this function. But, the danger would be leaving it in that position when you start to drive. That would lead to severe exhaust manifold overheating and very low power.
Thanks Brett, I thought that line (in the Pacbrake cut sheet) was interesting, never heard of it before. Plus, for us "old and in the way" types, there would have to be a "beep beep beep" warning to avoid driving out with the switch on! :-[