4. Clean the cooling system filler cap. Inspect the
gasket that is on the cooling system filler cap. If
the gasket that is on the cooling system filler cap is
damaged, discard the old cooling system filler cap
and install a new cooling system filler cap. If the
gasket that is on the cooling system filler cap is not
damaged, pressure test the cooling system filler
cap. The correct pressure for the cooling system
filler cap is stamped on the face of the cooling
system filler cap. If the cooling system filler cap
does not retain the correct pressure, install a new
cooling system filler cap.
5. Start the engine. Inspect the cooling system for
leaks and for proper operating temperature.
i05682210
Coolant Level - Check
Pressurized System: Hot coolant can cause seri-
ous burns. To open the cooling system filler cap,
stop the engine and wait until the cooling system
components are cool. Loosen the cooling system
pressure cap slowly in order to relieve the
pressure.
Check the coolant level when the engine is stopped
and cool.
NOTICE
When any servicing or repair of the engine cooling
system is performed, the procedure must be per-
formed with the engine on level ground. This proce-
dure will allow you to check accurately the coolant
level. This procedure will also help in avoiding the risk
of introducing an air lock into the coolant system.
1. Remove the cooling system filler cap slowly in
order to relieve pressure.
2. Maintain the coolant level at the maximum mark
that is correct for your application. If the engine is
equipped with a sight glass, maintain the coolant
level to the correct level in the sight glass.
Illustration 61 g02590196
Typical filler cap gaskets
3. Clean the cooling system filler cap and check the
condition of the filler cap gaskets. Replace the
cooling system filler cap if the filler cap gaskets are
damaged. Reinstall the cooling system filler cap.
4. Inspect the cooling system for leaks.
Note: The Diesel Exhaust Fluid (DEF) tank requires
coolant flow around the tank. The Coolant Diverter
Valve (CDV) will turn the flow on or off. If the coolant
system has been filled with the CDV in the closed
position, coolant level will drop because of the
opening of the CDV. The coolant flow will be diverted
when the ambient temperature is approximately
−5° C (23° F).
i07383194
DEF Filler Screen (Emission
Related Component) - Clean
NOTICE
Ensure that the engine is stopped before any servic-
ing or repair is performed.
M0092609-05 109
Maintenance Section
Coolant Level - Check
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