Holiday 2002 NEPTUNE, Owner'S Manual

Page: 308 / 344

Chassis Information
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2 0 0 2 N E P T U N E
10 • 308
Rotten, swollen and worn hoses, as well as loose connections, are frequent
causes of coolant system problems. Overheating can be caused by an collapsed
hose or a clog caused by rubber shedding from a rotten hose. Replace any hose
found to be cracked, swollen or damaged. Connections should be inspected
periodically and hose clamps tightened.
If the coolant system becomes frozen solid, place the motorhome in a warm
area until the ice is completely thawed. At this point the motorhome must be
towed. If the engine is operated when the cooling system is frozen it will result
in engine overheating due to insufficient coolant.
Once thawed, check engine, radiator and related components for damage
caused by expansion of frozen coolant.
If the engine is overheated, never pour cold coolant into a hot engine. The sud-
den change in temperature may crack the cylinder head or block. If the engine is
hot, fill slowly to prevent rapid cooling and distortion of engine castings.
The Allison MH-2000 series transmission is a fully automatic, torque-con-
verter driven, electronically controlled transmission. The electronic controls
provide automatic gear selection in all drive ranges and automatic engagement
of the torque converter lockup clutch.
The electronic control system has five major components: the Transmission
Control Module (TCM), engine throttle position sensor, three speed sensors,
Neutral Start Back Up (NSBU) switch and the control valve module. The TCM
processes information received from the throttle position sensor, speed sensor,
NSBU switch and control valve module. The electronic control system opti-
mizes shift quality by using “Adaptive Shifting.” A wide variety in shifting
under varied conditions is required before optimizing the shift quality.
Generally, five typical shifts of a shift type are needed for shift calibration.
Coolant Hoses
TRANSMISSION
Coolant System -
Thawing