What are the reasons for slow water temperature rise?

1 Answers
OMakayla
07/30/25 12:41am
The reasons for slow water temperature rise are: 1. The thermostat is not installed or is damaged. The thermostat controls the direction of coolant flow and manages the large and small circulation loops. When the thermostat fails, the coolant remains in the large circulation loop, causing the engine's water temperature to drop quickly; 2. Scale buildup on the water 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 water temperature rise because the car's heating system relies on the heat from the engine's coolant.
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