Checking
WARNING!
Do not open the coolant filler cap when the engine is
warm, except
in emergencies, this could cause serious
personal injury. Steam or hot fluid could spray out.
Turn the filler cap to the first stop and allow any excess
pressure to hiss out before removing the cap com-
pletely. Top the coolant up as necessary. The level
must be between the MAX and MIN markings.
Fault cause
Coolant temperature too low
Low coolant temperature can be caused by:
•
Faulty thermostat
•
Faulty temperature sensor or gauge
•
Low engine loading
Excessive coolant temperature
Excessive coolant temperature (warning lamp lights
up) can be caused by:
•
Blocked raw water inlet or raw water filter
•
Defective impeller in the raw water pump
•
Too low coolant level; air in the fresh water system
•
Slipping or broken coolant pump vee belt
•
Faulty thermostat, temperature sensor or gauge
•
Blocked cooling system
•
Incorrectly set injection advance in the injection
pump
•
Filler cap gasket does not seal
Coolant losses
There are two types of coolant losses
•
Coolant losses during operation
•
Coolant losses after stopping a hot engine
Coolant losses during operation can be due to a leak-
ing cooling system or air or combustion gases being
forced into the cooling system.
26-0 Cooling System, General
112 47701798 05-2013 © AB VOLVO PENTA
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