Correct answer
Generally at the coolant outlet from the cylinder head towards the radiator.
Generally at the coolant outlet from the cylinder head towards the radiator. It is a temperature-sensitive valve regulating flow towards the radiator: it restricts it when the engine is cold and permits it as temperature rises. The exact arrangement depends on engine design; do not assume it is always along the upper hose or locate it without manufacturer documentation.
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Always inside the combustion chamber, directly exposed to the flame.
Always in the fuel tank, regulating diesel flow.
Generally at the coolant outlet from the cylinder head towards the radiator.
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