{"id":6043,"date":"2024-11-01T07:06:24","date_gmt":"2024-11-01T07:06:24","guid":{"rendered":"https:\/\/www.exchangemycar.co.uk\/blog\/?p=6043"},"modified":"2026-04-03T14:07:10","modified_gmt":"2026-04-03T13:07:10","slug":"engine-coolant-temperature","status":"publish","type":"post","link":"https:\/\/www.exchangemycar.co.uk\/blog\/engine-coolant-temperature\/","title":{"rendered":"8 Reasons Why Your Engine Coolant Temperature is High"},"content":{"rendered":"

25% of all engine failures are attributed to negligence in changing engine coolant. Similarly, 95% of radiators fail due to old or contaminated coolant. This simple yet effective mixture of glycol and water is an integral fluid used to cool any internal combustion engine. <\/span>In this blog post, we\u2019ll discuss the reasons why your engine coolant temperature can get higher than it should be. <\/span><\/p>\n

Along with that, we\u2019ll also cover the symptoms of engine coolant overheating and the normal temperature range.<\/span><\/p>\n

So, without any further ado, let\u2019s get started.<\/span><\/p>\n

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What is the Normal Engine Coolant Temperature Range?<\/b><\/h2>\n

Different car brands and engine types have different ranges of optimum coolant temperature. However, as a general rule of thumb, it should lie between 195 and 220 degrees Fahrenheit, or in Celsius, it should be between 90\u00b0C and 105\u00b0C. When your car\u2019s coolant temperature is above 220\u00b0F (105\u00b0C), it is generally considered to be overheated.<\/span><\/p>\n

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Why High Engine Coolant Temperature is Bad for Your Car?<\/b><\/h2>\n

High engine coolant<\/a> temperature can be detrimental to your car’s performance and longevity. When the coolant gets too hot, it can cause a variety of problems. <\/span><\/p>\n

It <\/span>includes pre-mature engine wear, reduced engine power, knocking or pinging (pre-mature combustion), increased fuel consumption, damaged pistons, a blown head gasket, and ultimately, engine failure.<\/span><\/p>\n

Therefore, it is very important to keep an eye on the temperature of the engine coolant and take immediate action if it is over the specified limit in the owner\u2019s manual.<\/span><\/p>\n

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8 Reasons Why Your Engine Coolant Temperature is Over the Normal Range<\/b><\/h2>\n

Here are the top 8 reasons why your coolant temperature is higher than normal:<\/span><\/p>\n

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1. Environmental Factors<\/b><\/h3>\n

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The number one reason why your engine coolant might be running hot is simply due to the high ambient temperatures. This is especially true in hot climates or during heat waves. <\/span><\/p>\n

There\u2019s nothing you can do about it. You just need to avoid driving too much in this scenario. If you have to absolutely drive your car, make sure that the engine isn\u2019t running for extended periods.<\/span><\/p>\n

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2. Low Coolant Levels and Coolant Leaks<\/b><\/h3>\n

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Your coolant can become hot because there isn\u2019t enough of it in the reservoir. The engine coolant can get lost due to evaporation or leaks. Coolant leaks due to a blown head gasket<\/a> are pretty normal. When a small volume of coolant tries to remove engine heat, its temperature can rise very quickly, leading to an overheated engine.<\/span><\/p>\n

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3. Clogged Radiator or Hoses<\/b><\/h3>\n

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Over time, debris, rust, and sediment can accumulate in the car\u2019s radiator or hoses, obstructing the coolant flow. A clogged radiator or hose reduces the cooling system’s ability to dissipate heat, leading to increased engine coolant temperatures.<\/span><\/p>\n

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4. Faulty Radiator Fan or Cap<\/b><\/h3>\n

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A radiator fan aids the engine cooling process by forcing airflow over the hot coolant. When the fan is broken, the heat dissipation from the engine coolant becomes slow. <\/span><\/p>\n

Similarly, a radiator cap maintains the pressure inside the radiator. When it isn\u2019t working properly, the pressure buildup inside the radiator can lead to higher engine coolant temperature.<\/span><\/p>\n

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5. Faulty Thermostat Valve<\/b><\/h3>\n

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The thermostat regulates the flow of coolant to maintain the engine at the optimal operating temperature. If the thermostat is stuck closed, it prevents coolant from circulating, causing the engine to overheat<\/a>. <\/span><\/p>\n

Conversely, if it is stuck open, it may not allow the engine to reach the proper temperature. Both conditions can cause the coolant temperature to deviate from the normal range.<\/span><\/p>\n

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6. Water Pump Going Bad<\/b><\/h3>\n

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The water pump is responsible for moving coolant from the radiator through the engine and back. This circulation is critical for absorbing heat generated by the engine and dissipating it through the radiator. <\/span><\/p>\n

Any hindrance in the flow of engine coolant caused by a failing water pump can lead to a high coolant temperature and, in turn, a high engine temperature.<\/span><\/p>\n

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7. Excessive Engine Load<\/b>\u00a0<\/span><\/h3>\n

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Heavy acceleration, towing, or carrying excessive weight can place additional stress on the engine, causing it to work harder and generate more heat. This increased workload can push coolant temperatures above the normal range, especially if the cooling system is already compromised.<\/span><\/p>\n

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8. Blocked Exhaust<\/b><\/h3>\n

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A blocked or restricted exhaust system can lead to increased back pressure, causing the engine to run hotter than normal. This can result from a clogged catalytic converter<\/a> or exhaust pipe. If the exhaust gases cannot escape efficiently, it can lead to overheating and potential engine damage.<\/span><\/p>\n

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Why low engine coolant temperature is also bad?<\/b><\/h2>\n

It\u2019s not only the hot coolant that is problematic; cold engine coolant poses risks of its own. Therefore, it is important that the coolant is maintained within the optimum temperature range. Here are the risks associated with too-cold engine coolant:<\/span><\/p>\n