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Honda Accord Overheating Problem

Overheating Honda Accord can burst hoses, bend cylinder heads, or break the head gaskets, damaging the sensitive engine components. The most common signs of overheating include a temperature gauge warning on your dashboard and smoke or unusual smell.

A common reason for a Honda Accord overheating is a malfunctioning thermostat. If the thermostat is stuck closed, it can prevent coolant from circulating through the engine, causing the temperature to rise. Replacing the thermostat can often resolve this overheating issue.

Male car driver with hands on steering wheel

Another potential cause could be a leak in the cooling system. Just like a garden hose with a hole in it can’t effectively water your plants, a cooling system leak can’t keep your engine at the right temperature. Inspecting hoses, the radiator, and the water pump for leaks and repairing or replacing any faulty components can help prevent the engine from overheating. This ensures the cooling system can maintain the proper fluid level and pressure to keep your engine cool.

Lastly, a clogged radiator can also lead to overheating problems. Over time, debris and sediment can build up inside the radiator, much like how arteries can become clogged, preventing proper blood flow. This restricts coolant flow, reducing the radiator’s efficiency in dissipating heat. Flushing the radiator to remove any blockages can restore its functionality, ensuring it can adequately cool the engine and prevent overheating.

Honda Accord Overheating When The AC Is On

Female pushing car AC button

If your Honda Accord is overheating when the AC is on, it can be torture, especially when driving on a hot summer afternoon. Knowing the root cause of this problem is the first step toward fixing it.

A Honda Accord can overheat when the AC is on due to an inefficient cooling system, AC compressor overload, faulty radiator, broken fan, or malfunctioning engine coolant sensor. Inspect the cooling system for damages to the radiator, thermostat, fan, and water pump. Replace any broken parts.

You can also check the AC compressor and the engine coolant sensor and replace the damaged parts.

An AC compressor overload can exert extra pressure on the engine, causing it to overheat. Test the compressor by observing any RPM increase when turning the AC on. If you fail to notice any movements, the AC is faulty. You can also listen for any noises when the AC is moving, indicating it’s defective.

The cooling system consists of a radiator to disperse heat, a fan to promote adequate airflow, a thermostat to regulate engine temperature, and a waterpump to supply engine coolant. Therefore, the AC will not cool the engine if these components are broken because it won’t cool the condenser when you turn the AC on.

The engine coolant sensor signals the control module to turn on the fan when the engine overheats. Therefore, when the sensor is broken, it may send the wrong signal to the fan that the engine is cool. As a result, the fan will not turn on even when the AC is on.

A radiator fan supplies cool air to the engine coolant to lower its temperatures and cool the engine. When it malfunctions, the engine may overheat even when the AC is on. A fan may malfunction when the radiator passage is blocked or when any of its components are damaged. Replacing the fan can solve this problem.

Honda Accord Overheating While Driving

Back view of female car driver

When your Honda Accord overheats while driving, it can cause an abrupt end to your journey and put your life in danger. Although it’s normal for an engine to heat up while driving in hot weather when the car is inadequately ventilated, overheating is usually an underlying problem.

A Honda Accord may overheat while driving due to a leakage in the cooling system, faulty radiator, broken water pump, or blocked hoses. When the engine is cool, inspect the engine for leakages, coolant levels, and damage to the water pump, radiator, hoses, and thermostat. Replace any damaged parts.

Your Honda Accord can overheat while driving when the cooling system fails to cool the engine. The cooling system supplies engine coolant or antifreeze to the engine through the radiator to remove excess heat from the engine.

Manufacturers recommend a certain level of coolant to regulate engine temperatures. When the coolant level falls below this, it may not adequately cool the engine, leading to overheating. Pull the car over if you are driving in a safe area.

You can continue driving the vehicle at low speed if you feel unsafe to pull over until you reach a safe place. It’s completely safe to turn on the heat and turn off the AC to draw heat away from the engine. Besides, remember to open the car windows to allow cool air circulation.

Allow the engine to cool before opening the hood and confirm that the temperature gauge reads ‘cool.’ use your manufacturer manual to locate the reservoir and add a 50/50 mixture of coolant and water until it reaches average level.

Sometimes the coolant levels may be low due to leakage. Look under the vehicle for any puddles and look out for an unusual sweet smell or white smoke from the engine.

Leakages occur from the radiator when it’s cracked or rusty. Additionally, a low-quality coolant may damage the radiator by causing deposits that clog it. Similarly, a malfunctioning radiator fan can cause an increase in engine temperatures. As a result, the AC may blow hot air across the condenser, causing the engine to overheat. If this happens, replacing the radiator is necessary.

When the thermostat malfunctions, it can fail to regulate engine temperatures, causing overheating. Similarly, the water pump regulates the motor temperature by passing hot water into the radiator for cooling and back to the motor to regulate engine temperature. Therefore, a damaged water pump can cause overheating while driving.

The water pump may be faulty due to an eroded gasket, causing coolant leakage. In this case, replacing the water pump may solve this problem. Consider calling a mechanic to fix any broken parts you may have identified.

Honda Accord Overheating at Idle

Female car driver with hands over face in shock

When your Honda Accord overheats at idle, it can cause significant damage to the engine. However, identifying and addressing the source can fix the problem.

Honda Accord may overheat at idle due to thermostat damage, coolant contamination, or radiator damage. Open the car hood to test if the fan is working. Check the radiator for damages and test the coolant for any contamination. Replace the contaminated coolant, broken fan, or radiator.

When a thermostat works incorrectly, it can either get stuck open or closed. When your Honda Accord is not moving, the thermostat remains closed until the engine coolant reaches a specific temperature. The thermostat opens when the coolant temperature rises to prevent overheating.

When a thermostat is faulty, it remains closed even when coolant temperatures rise, thus causing engine overheating. Check if the thermostat is stuck closed by touching the upper and lower radiator hoses. If both hoses are warm, it indicates the thermostat is regular. But if both hoses have different temperatures, the thermostat is faulty.

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A thermostat can also get damaged by excess pressure causing engine coolant leakage. Remove the thermostat from its housing to ascertain if it has a leakage and bring it to the kitchen.

Check the temperature stamp on the thermostat and heat water to the same temperature. Put the thermostat into the water to see if it opens. If it fails to open, it means it’s damaged.

When the engine coolant gets contaminated, it can cause a thermostat malfunction resulting in engine overheating. It can get contaminated when you use different types of coolants at the same time. As a result, chemicals from the different types react to form deposits that pollute the coolant. Additionally, rust from excess water can spoil the coolant.

Test the coolant quality to see if it remains liquid at low temperatures. Check for corrosives because they can damage the water pump, radiator, and thermostat. Additionally, check for additives using a multimeter. If it reads 4V and below, it means the coolant is clean. But if it reads more than 4V, the coolant is contaminated.

When the radiator fan is broken, the engine will overheat at rest and remain cool when the car starts. This is because airflow from a moving vehicle lowers coolant temperature to reduce overheating. A failed motor or electrical hitches can damage the radiator fan. A replacement will solve the problem and prevent engine damage in this case.

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KnowMyAuto is the sole owner of this article was published on Sep 1, 2022 and last updated on .