Engine Block Heater; Engine Warm-Up; Allison Transmission Warm-Up - PREVOST H3-45 2023 Operator's Manual

The engine will shut down at the set time under
the following conditions:
Vehicle speed is 0;
l
Engine is running at normal idle speed;
l
Engine coolant temperature above 120°F
l
(49°C);
Temperature inside vehicle is between 59°F
l
(15°C) and 81°F (27°C);
Parking brake applied;
l
Transmission into neutral (N);
l
Wheelchair lift system not in use;
l
Pressing the fuel pedal will prevent engine
shutdown and restart countdown.

ENGINE BLOCK HEATER

The vehicle may be equipped with an engine
immersion- type electric block heater to assist
cold weather starting. A connector is on the rear
pillar of the curbside engine compartment door
frame. Using an extension cord, connect to a 110
- 120 VAC outlet.
CAUTION
Connect only to a 120 VAC power source. Use
only grounded (three prongs) extension cords
with a minimum rated capacity of 15 A.
Disconnect the extension cord before starting.
Before driving, make sure the extension cord is
disconnected.
FIGURE 5: ENGINE BLOCK HEATER CONNECTOR
(TYPICAL)
Starting and Stopping Procedures 6-7

ENGINE WARM-UP

After starting the engine, keep the parking brake
applied and let the engine run at normal idle for
two minutes to allow lubricating oil to reach the
turbocharger. Increase engine speed to fast idle,
using the fast idle switch located on the
dashboard for five minutes, without loading the
engine. Monitor the gauges and indicator lights
to make sure all conditions are normal. If an
abnormal condition is observed, stop the engine
immediately and have the condition corrected.
NOTE
The engine will reach normal operating
temperature shortly after driving. Avoid driving
at full throttle until engine coolant temperature
reaches 140°F (60°C).
Never let the engine run in an enclosed, non-
ventilated area. Engine exhaust fumes contain
dangerous gases which can be fatal if inhaled.
Before warming up the engine, open the door
(s) or move the vehicle outside.

ALLISON TRANSMISSION WARM-UP

With an automatic transmission, when the
temperature falls below - 20°F (- 29°C), the
CHECK telltale light illuminates after the engine is
started, and a reminder tone will sound. In this
case, the transmission will be locked in neutral
(N) until the transmission temperature rises
above -20°F (-29°C) and the CHECK telltale light
goes out. The transmission will only operate in
first or reverse gears until it reaches normal
operating temperature.
PA-1652 Operator's Manual H3-45 Coach
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