A vehicle's thermostat is working erratically, leading to overheating. What should be done?
Replace thermostat
A cooling system holds the engine at its correct temperature by opening and closing a valve in the coolant path as needed. When that control valve misbehaves, the right repair depends on whether it can be serviced.
That valve is the thermostat, a sealed unit whose wax element expands with heat to open the passage to the radiator and contracts to close it.
Erratic operation and overheating show the wax element has failed and the valve is sticking, so coolant is not routed to the radiator when it should be.
A thermostat is a sealed, non-serviceable component; its internal wax element cannot be reliably reset or repaired once it fails.
The water pump still circulates coolant and is not the fault here, and opening a radiator shutter is only a stop-gap that does not cure a stuck valve.
The dependable fix is to fit a new thermostat of the correct rating.
Hence, the answer is 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:
