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What are the causes of excessively high engine coolant temperature?

2 Answers

LenaDella

07/29/25 4:56am

Causes of excessively high coolant temperature are as follows: 1. Insufficient engine coolant; 2. Faulty water temperature sensor or gauge; 3. Overly lean or rich air-fuel mixture; 4. Excessive carbon buildup in the combustion chamber. Additional information: 1. Function of coolant: It circulates within the engine radiator to protect normal engine operation, providing effects such as antifreeze, anti-boil, anti-rust, and anti-corrosion. Proper use of coolant can prevent corrosion, cavitation leakage, radiator boiling, scale formation, and freezing, ensuring the cooling system remains in optimal working condition and maintaining the engine's normal operating temperature. 2. Characteristics of coolant: Coolant features include high boiling point, low foaming tendency, excellent viscosity-temperature performance, as well as anti-corrosion and anti-scaling properties.

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StSilas

08/12/25 8:34am

I'm totally qualified to speak on this, just helped my neighbor with it last week. Engine overheating usually boils down to a few usual suspects: the radiator fins completely clogged up - in summer, bug splats and willow catkins plastered all over them during highway drives, rendering heat dissipation useless; coolant either all leaked out or unchanged for 3-5 years, becoming as ineffective as plain water; the cooling fan outright quits - broken belt or stuck electronic fan controller; water pump impeller worn and slipping, preventing antifreeze from circulating; and then there's this clever troublemaker called the thermostat, stuck closed permanently blocking coolant from entering the main circuit. Remember - the moment the temperature warning light comes on, pull over immediately. Otherwise, cylinder scoring repairs will hurt your wallet badly.

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