Section 05: COOLING SYSTEM
PA1562
8
FIGURE 12: THERMOSTAT HOUSING (VOLVO D13
ENGINE)
3. Install the new thermostat. Make sure that
the rubber seal remains properly seated.
4. Position the thermostat housing to the
cylinder head, install the bolts and torque-
tighten to 24 ± 4 Nm (18 ±3 ft-lb).
5. Install the rubber radiator hose to the
thermostat housing. Position the clamp and
tighten to secure.
6. Fill the system with the recommended
coolant.
7. Start the engine, check for leaks and proper
operation. After shutdown, replenish fluids as
necessary.
4.2.1 Thermostat Checking
A function check must be carried out before
installing a new thermostat.
NOTE
Check to be sure that the thermostat closes
fully. This can be done by holding it up to the
light to check that there is no visible gap at the
opening point. If the thermostat does not close
properly, replace it.
1. Warm up water in a receptacle to 75°C
(167°F) and immerse the thermostat in the
water. Use a piece of wire attached to the
thermostat.
2. After at least 30 seconds, check that the
thermostat is still closed.
3. Now warm the water to 100°C (212°F). After
at least 30 seconds at the boiling point,
check that the thermostat has opened at
least 7mm (9/32in). If the thermostat has not
opened, it must be replaced. A good
thermostat starts to close at 95°C (203°F)
and is fully closed at approximately 85°C
(185°F).
5. COOLANT
5.1 COOLANT LEVEL VERIFICATION
Coolant level is correct when cold coolant is
visible through the surge tank sight glass
(Fig. 13). If coolant level is low, fill cooling
system.
FIGURE 13: SURGE TANK SIGHT GLASS 05114
5.2 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 R.H. side of
the surge tank.
5.3 THAWING COOLING SYSTEM
If the cooling system becomes frozen solid,
place the coach in a warm area until the ice is
completely thawed. 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 thawed, check engine, radiator and
related components for damage caused by
expansion of frozen coolant fluid.
5.4 COOLING SYSTEM RECOMMENDATIONS
Always maintain cooling system at the proper
coolant level. Check daily.
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.
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