The purpose of a radiator cap is to maintain the appropriate pressure of a vehicle’s cooling system. Faulty Radiator CapĪnother cause of coolant reservoir boiling could be a faulty radiator cap. While this can be expensive, you may also use leak repair fluid at home if you are looking for an affordable solution. It would be best to let a car mechanic fix the leak to fix this problem. It is why if your car has a blown head gasket, you should tend to it right away. If your car’s head gasket is blown, it may also cause overheating, white exhaust smoke, and steam under the bonnet. When a head gasket is broken, it can result in compressed air from the cylinders entering the cooling system as they are being blown into the water jacket.Īs a result, bubbles may form in the coolant reservoir, which is why it may appear that your coolant reservoir is boiling. The purpose of a head gasket is to seal the combustion gases within cylinders and prevent coolant and engine oils from leaking into the cylinders. You may follow any step-by-step instruction video on how to replace a thermostat. Replacing a thermostat is easy and inexpensive, and you can do it yourself. Instead, it would be best if you replaced it right away. While your engine may still run and your car may still move, you do not want to drive your car with a failed thermostat. Since a thermostat regulates coolant flow around the engine, this cause of coolant reservoir boiling can be severe.Ī thermostat may fail due to overheating, sludge formation over time, a defect in the thermostat itself, or the thermostat being too old. It includes high-temperature readings on the gauge, heater malfunction, and coolant leaks. You will know that the reason behind your car coolant reservoir boiling is lack of temperature control when you notice some other things along with the coolant boiling. Lack of temperature control happens due to a failed thermostat. While replacing a fuse or broken wiring is cheaper, replacing a temperature switch can be expensive. To fix a failed cooling fan, you will have to get down to the cause and replace the part causing the problem, the relay, motor, a blown fuse, or the temperature switch. If the cooling fan motor fails, its blades stop spinning, and airflow is not generated. When the fan does not keep the radiator cool, the car coolant reservoir can boil.Ī failing cooling fan is characterized by overheating the engine and often a loud noise coming out of the radiator fan. Wiring problems usually occur due to a blown fuse or connectors eroded over time. A cooling fan may start to fail due to many reasons, including wiring problems. The purpose of a cooling fan is to keep the radiator cool while the engine is off. Pour in some more coolant to normalize the levels. Eventually, the coolant will start coming in smoothly.Īfterward, you may notice that your coolant levels have gone down as the air trapped in it is gone. The bubbles in the coolant will be visible in the coolant at first. Let your car run until the fan comes on and turn your aircon to its warmest temperature and turn its fan to full speed. It is a relatively easy fix if your car’s coolant reservoir is boiling due to trapped air.Īll you need to do is unscrew your coolant reservoir and start the car. It can explain air pockets in your coolant, which may not even be accompanied by overheating. When the engine cools down again, these air pockets contract and the coolant is sucked to replace air, causing bubbles. When the engine is running and heating up, these air pockets may expand and move into the coolant reservoir. Sometimes, when you refill your coolant, you may follow an improper flushing procedure which can cause air pockets to be trapped in the cooling system. Here are some reasons why this may be happening, explained: Air Pockets It may be due to a failed thermostat, a blown head gasket, or even rust.īefore resolving the issue, you will have to diagnose the cause behind your car coolant reservoir boiling. If you do not know why your coolant reservoir is boiling, it can be challenging to sort out the problem right away.
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