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| Cooling System Thermostat Specification Table | |
| Category | Details |
| Opening Temperature | Standard opening temperature: typically 83°C; Fully open temperature: approximately 95°C; Some specifications: 85°C–95°C |
| Weight | Net weight: approximately 0.12kg - 0.2kg (120g to 200g) |
| Packaging Dimensions | Standard single-piece packaging: typically around 10cm × 10cm × 10cm |
| Material Composition | Primarily composed of copper (temperature sensor), stainless steel (spring and bracket), and high-quality ABS/metal composite materials (to ensure no rust or failure under prolonged high temperatures and coolant immersion) |
| Color | As shown in the picture |
| Inventory | 600 pieces |
| Delivery time | 7-15 days |
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1. Shortening Warm-up Time (“Small Circulation” Stage)
Action: When the engine is first started and the coolant temperature is below 83°C, the thermostat is closed.
Principle: It cuts off the path to the radiator (water tank), allowing the coolant to circulate only within the engine block (called the “small circulation”).
Core Purpose: To prevent heat loss, allowing the engine to warm up to its optimal operating temperature as quickly as possible, thereby reducing metal wear caused by cold starts and lowering early emissions.
2. Precisely Regulating Engine Operating Temperature (“Large Circulation” Stage)
Action: When the coolant temperature rises to between 83°C and 95°C, the thermostat's temperature-sensing element expands due to heat, and the valve gradually opens.
Principle: Coolant begins to flow to the external radiator for heat exchange (called the “large circulation”). The valve opening adjusts in real time according to the temperature.
Core Purpose: To ensure the engine always maintains its optimal efficiency range of 85°C-95°C. If the temperature is too high, power will decrease or even cause cylinder scoring; if the temperature is too low, poor fuel atomization will lead to increased fuel consumption.
3. Protecting Fuel Economy and Emissions Performance
Function: MAN technology (MC11/MC13) engines have extremely high requirements for thermal efficiency.
Core Purpose: The thermostat maintains a constant temperature, ensuring optimal oil flow and reducing internal friction. For current China VI or Euro VI emission standards, the aftertreatment system (SCR/DPF) can only efficiently convert exhaust gases under stable high-temperature conditions.
