What are the reasons for the slow temperature rise in the Sagitar's coolant?
3 Answers
The reasons for the slow temperature rise in the Sagitar's coolant are: 1. The thermostat is not installed or is damaged. The thermostat controls the direction of the coolant flow, managing the large and small circulation loops. When the thermostat fails, the coolant remains in the large circulation loop, causing the engine's temperature to drop quickly. 2. Scale buildup on the temperature sensor can reduce its sensitivity, leading to inaccurate temperature readings. 3. A malfunction in the cooling fan circuit system can cause the engine to remain in forced cooling mode for extended periods. 4. Turning on the heater immediately after starting the car can slow down the temperature rise, as the car's heating system relies on the heat from the engine's coolant.
I've been driving a Sagitar for several years, and slow water temperature rise is a common issue. The most frequent cause is a stuck thermostat, which should close the coolant's small circulation loop when the engine is cold to allow for quick warming. If it's stuck in the open position, the coolant keeps circulating in the large loop, preventing the water temperature from rising. Insufficient or degraded coolant is also common—check the fluid level and whether it appears cloudy. Water pump failures are less common, but if the impeller is damaged or the belt is loose, circulation efficiency drops. This is especially noticeable in winter, when short trips make it hard for the engine to warm up, affecting driving comfort and increasing fuel consumption and engine wear. I recommend visiting a specialized repair shop to replace the thermostat with an OEM part and regularly checking and maintaining the coolant.
As a DIY enthusiast, slow coolant temperature rise in the Sagitar is mostly caused by thermostat issues. It controls coolant flow direction - if stuck open, the engine circulates coolant for cooling even when cold. Excessive coolant impurities or low concentration reduce heat transfer efficiency. Faulty temperature sensors may also mislead the system. Insufficient water pump speed causing poor circulation can also delay warming. I personally solved this by replacing the thermostat. Low coolant temperature leads to insufficient cabin heating, poor driving experience, and wasted fuel. Early inspection prevents bigger failures.
