What Are the Reasons for Frequently High Car Coolant Temperature?

1 Answers
ElliottAnn
07/29/25 3:45pm
"The reasons for the car coolant temperature always showing high include insufficient coolant, faulty radiator fan, and faulty circulation water pump. Insufficient Coolant: Coolant leakage or low coolant levels can cause the engine temperature to rise. In this case, the coolant level should be checked. If it is low, first top it up to the appropriate level, then check again after a few days to see if the level has dropped significantly. If it has, locate the leak and repair it. Since the coolant reservoir has many small tubes, if the coolant leakage is due to loose connections, you can wrap the damaged tube with a rope or plastic bag. If it's just a matter of low coolant, simply add more coolant. Note that you should wait for the coolant temperature to drop before adding more. In an emergency, clean water can be used as a temporary substitute. However, it's important to note that clean water should only be used as a stopgap measure. Once the temperature returns to normal, new coolant should be replaced as soon as possible. Faulty Radiator Fan: If the radiator fan is faulty, the heat generated during high-speed operation cannot be effectively transferred to the coolant, affecting heat dissipation. This can lead to an increase in coolant temperature, causing issues like boiling. Immediate repair is necessary. Faulty Circulation Water Pump: Water pump issues can include seized bearings or damaged impellers. Seized bearings are relatively rare, while damaged impellers are more common, such as cracked impellers or impellers loosening from the pump shaft. This slows down the circulation of coolant, leading to engine overheating. Prompt repair is required."
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