Ron and Susan at Creede
We are still at Creede and will leave monday. It has been clear
and somwhat breezy. We think we will
go north through Denver and Montana on the way home.
My manual for my 1988 newell (first half 1988-no DDEC) states that a red high temp light will come
on at approximately 210 degrees.
(water temperature wire is Blue with 1 Black)
If engine coolant reaches approximately 215 degrees an automatic engine shutdown will activate.
If it is necessary to move the coach a short distance
to safely park, the automatic shutdown can be temporarily
deactivated by the use of the switch labeled "override" on the
dash. (This switch is covered by a red safety cover and is located
directly above the steering column).
This switch can also be used to run the engine while parked to
allow the engine to cool evenly unless the overheat was caused
by low coolant.
A low coolant light on the dash signals low coolant
level, a condition requiring prompt correction. In this case, the
engine should not be restarted until it has first allowed to cool and
the the cooling system has been repaired and refilled.
I dont know how accurate this temperature setting are but I suspect
that they may be done with preset thermostats.
I traced the wiring from the override switch (grey with 1 blue) to a 24016 relay (same size as the battery merge relay)
in the rear compartment
and found the the relay was connected between 12 volts and
what appears to be a fixed thermostat with normally closed contacts,
mounted near where a hose with a shutoff valve exits the engine, the thermostat is made by MSON and is
marked 220.
The override relay apparently shorts across the normally closed thermostat contacts
that must open at 220 degrees to stop the engine. It seems
strange that Newell used such a large relay (75 amps) but only has
#18awg wire connect to it. Must have been done to keep all the
relays alike as much as possible. I have not found the thermostat
that turns on the High temp light on the dash.
I dont have any electrical schematics, even a typical schematic
might be helpful if it exists.
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