What is the normal temperature range for a diesel engine's coolant?

1 Answers
SanAna
07/30/25 9:18am
Water temperature is optimal between 70-92°C. Below are the thermostat's operating conditions: 1. When coolant temperature reaches 70-80°C: The thermostat is partially open, allowing coolant from the engine water jacket to flow through the partially open thermostat space to the radiator, achieving semi-circulation; 2. When coolant temperature reaches 80-92°C: (Note: some models may vary, this applies to most market models) The thermostat fully opens, enabling coolant from the engine water jacket to flow through the fully open thermostat space to the radiator in continuous circulation, achieving complete circulation; 3. Optimal temperature: Through coolant flow and fan operation, engine heat is dissipated to maintain the engine's ideal working temperature.
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