Which combination of actions helps prevent engine overheating due to coolant flow issues?
Flush cooling system and replace thermostat
The principle is that overheating from coolant flow issues must be cured by restoring free circulation of coolant, so the correct actions have to act on the cooling circuit itself.
Flushing the cooling system washes out scale, rust and sludge that clog the radiator core and the water passages, re-opening the path for coolant to flow.
Replacing the thermostat ensures the valve opens fully at its rated temperature; a thermostat stuck closed blocks coolant from reaching the radiator and directly causes overheating.
Together these two actions clean the circuit and restore correct valve operation, tackling exactly the flow problem described.
Adjusting injector pressure and cleaning the air intake affect fuelling and breathing, not coolant flow, so that pair cannot fix the fault.
Changing fuel type alters combustion only, and replacing the exhaust manifold gasket or checking timing deal with exhaust and valve events; none of these touch coolant circulation, so they are incorrect.
Hence, the answer is Flush cooling system and replace thermostat.
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Important Questions from Cooling System
What happens to the engine when the fan belt is too tight?
The fins at the top of the cylinder of a motorcycle engine are longer than those at the bottom because:
Which of the following is a part of the cooling system?
What happens when the water level in the radiator is low?
The lower hose pipe is connected between:
