Coolant; Coolant Level Verification; Coolant Level Sensor; Thawing Cooling System - PREVOST H3-41 Maintenance Manual

SECTION 05: COOLING SYSTEM
6.

COOLANT

6.1

COOLANT LEVEL VERIFICATION

Cold engine coolant level is correct when coolant
is visible halfway up through the surge tank
lateral sight tube on the H3 series or when the
coolant level is visible between the two level
marks in the X3 Series recovery tank (Figure 2 &
Figure 3). If coolant level is low, fill cooling
system.
6.2

COOLANT LEVEL SENSOR

This warning device consists of a fluid level
probe mounted on the surge tank. The probe
sends a signal to the engine control module to
indicate coolant level. If the coolant level drops
below the probe, the "Check Engine" light
flashes and a diagnostic code is registered (see
section 01" ENGINE").
CAUTION
Do not run engine with the "Check Engine"
light flashing.
The level probe is mounted on the front of the
surge tank.
6.3

THAWING COOLING SYSTEM

If the cooling system becomes frozen solid,
place the coach in a warm area until the ice is
completely thawed.
CAUTION
Under no circumstances should the engine be
operated when the cooling system is frozen,
as it will result in engine overheating due to
insufficient coolant.
Once it is thawed, check engine, radiator and
related components for damage caused by
expansion of frozen coolant fluid.
14
PA1621 Maintenance Manual All Series
6.4 COOLANT RECOMMENDATIONS FOR
VOLVO D13 ENGINE
The coolant provides a medium for heat transfer
and controls the internal temperature of the
engine during operation. In an engine having
proper coolant flow, some of the combustion
heat is conveyed through the cylinder walls and
the cylinder head into the coolant. Without
adequate coolant, normal heat transfer cannot
take place within the engine, and engine
temperature rapidly rises.
To function properly, the cooling system must be
pressurized to prevent localized boiling of
coolant. The system must be kept clean and
leak-free. The filler and pressure caps must be
checked periodically for proper operation.
Always maintain cooling system at the proper
coolant level. Check daily, use recommended
extended life coolant (ELC) with 50/50 antifreeze
and deionized water mixture ratio. This ratio
should be used year-round to provide freeze and
boil-over protection as well as providing a stable
environment for seals and hoses.
When topping up coolant, use the same coolant
mixture type as the mixture already in the cooling
system. Do not mix two different types of
coolant.
Do not use antifreeze formulated for automobile
gasoline engines, these have a very high silicate
content that will clog the radiator and leave
unwanted deposits in the engine.
A decal located on the surge tank provides
information on recommended coolants.
CAUTION
On Volvo D13 engine, use only Extended
Life Coolant
supplemental coolant additives (SCA) to
extended life coolant. Do not use a
coolant filter containing Supplemental
Coolant Additives (SCA).
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Section 05 revised Feb 2019
Do not
(ELC). add